CHE-05 Solved Question Paper for June 2026 gives you the official IGNOU CHE-05 Organic Chemistry term-end paper with all 23 parts answered in full by our chemistry team.
CHE-05 Organic Chemistry June 2026 key facts
- Course code: CHE-05
- Course title: Organic Chemistry
- Programme: IGNOU Bachelor of Science (B.Sc.), BDP, programme code BSC
- School: School of Sciences (SOS)
- Credits: 4 (about 120 study hours)
- Blocks / units: 4 blocks: Fundamental Concepts; Basic Skeleton: Hydrocarbons and Heterocyclic; Derivatives of Hydrocarbons I; Derivatives of Hydrocarbons II. Unit count [VERIFY]
- Maximum marks: 50 (term-end paper)
- Duration: 2 hours
- Questions in the paper: 4 main questions with 23 parts; you attempt 20
- Choice rule: all five parts of Q1 are compulsory; any five of six parts in each of Q2, Q3 and Q4
- Marks split: 5 Γ 1 + 5 Γ 2 + 5 Γ 3 + 5 Γ 4 = 50 attempted (59 printed)
- Printed word limit: none
- Paper language: printed in English and Hindi
- Samples shown on this page: 2 (Q3(c) and Q4(b))
- Questions in the paid file: All 23 parts answered; 21 are not shown on this page
- Assessment weightage: 30% assignment (TMA), 70% term-end exam
What the CHE-05 Solved Question Paper June 2026 covers
CHE-05 Organic Chemistry is a chemistry elective in the IGNOU Bachelor of Science (B.Sc.) programme, run by the School of Sciences, that takes you from naming and stereochemistry through hydrocarbons and functional groups to amines and biomolecules.
The June 2026 paper is a 50-mark, two-hour test. It asks you to name a simple polyhydric alcohol, draw the geometrical isomers of butenedioic acid, read the NMR splitting of chloroethane, explain why pyridine beats pyrrole as a base, and write mechanisms for nitration, Friedel-Crafts alkylation and Claisen condensation.
Our answers were written after reading earlier CHE-05 papers alongside this one, so the file also shows you which reactions keep coming back. Students who want the bare paper first can compare it with every other BSC Question Paper in their elective list.
CHE-05 Organic Chemistry sample answers from June 2026
Two complete CHE-05 answers from the June 2026 paper are given below, one 3-mark and one 4-mark, so you can judge the depth before asking for the full file.
We picked one carbonyl question and one aromatic mechanism because they test two different skills: explaining why a reaction fails, and drawing a multi-step mechanism with a rearrangement. Both answers were written by our team, as the IGNOU paper carries questions only.
Question 3(c) (3 marks)
Q3(c) 3 marks Block 3 Asked in June and December 2025
Why does benzaldehyde not undergo Aldol condensation? What happens when it is treated with conc. NaOH solution? 3
Answer: Aldol condensation needs at least one Ξ±-hydrogen. A base removes this hydrogen to form an enolate ion, and that carbanion then attacks the carbonyl carbon of a second molecule. In benzaldehyde, C6H5CHO, the carbonyl carbon is bonded directly to a ring carbon that carries no hydrogen, so no enolate can form and aldol condensation does not occur.
With concentrated NaOH, benzaldehyde undergoes the Cannizzaro reaction, a self oxidation-reduction (disproportionation). One molecule is oxidised to the benzoate ion and a second is reduced to benzyl alcohol. Acidifying the mixture then releases benzoic acid.
2 C6H5CHO + NaOH (conc.) β C6H5CH2OH + C6H5COONa
C6H5COONa + HCl β C6H5COOH + NaCl
- OHβ attacks the carbonyl carbon of one benzaldehyde molecule to give a tetrahedral alkoxide anion.
- This anion transfers a hydride ion (Hβ) to the carbonyl carbon of a second benzaldehyde molecule. This is the slow, rate-determining step, and it produces benzoic acid and the benzyloxide ion.
- A fast proton exchange gives the benzoate ion and benzyl alcohol as the final products.
Marking note: the three points examiners look for are the missing Ξ±-hydrogen, the balanced Cannizzaro equation and the hydride-transfer step.
Length check: a 3-mark part gets about 6.6 minutes, roughly 75 words with the equation. This answer is written for revision and runs well past that. In the hall, keep the no-Ξ±-hydrogen sentence, the first equation and step 2 (hydride transfer); drop the acidification line and steps 1 and 3 if time is short.
Question 4(b) (4 marks)
Q4(b) 4 marks Block 2 In the 2025 assignment (Q9)
Discuss the mechanism of the following reaction: [benzene] + CH3CH2CH2Cl, AlCl3 β 4
Answer: This is a Friedel-Crafts alkylation. Because the electrophile rearranges before it attacks the ring, the major product is isopropylbenzene (cumene), not n-propylbenzene, which forms only as the minor product.
C6H6 + CH3CH2CH2Cl (AlCl3) β C6H5CH(CH3)2 (major) + C6H5CH2CH2CH3 (minor) + HCl
- Electrophile generation: the Lewis acid AlCl3 pulls chloride from 1-chloropropane: CH3CH2CH2Cl + AlCl3 β CH3CH2CH2+ + AlCl4β.
- Rearrangement: the primary propyl cation undergoes a 1,2-hydride shift to give the secondary isopropyl cation, (CH3)2CH+, which is more stable because two methyl groups release electrons by the +I effect and hyperconjugation.
- Attack on the ring: the Ο electrons of benzene attack the carbocation, forming a resonance-stabilised arenium ion (Ο-complex). Aromaticity is lost for a moment and the positive charge spreads over the ortho and para carbons.
- Deprotonation: AlCl4β removes H+ from the sp3 carbon, aromaticity returns, and the products are cumene, HCl and regenerated AlCl3, which acts as a catalyst.
Some n-propylbenzene still forms when the polarised CH3CH2CH2βClΒ·Β·Β·AlCl3 complex reacts with benzene before the shift is complete, which is why it appears as the minor product.
Limitations worth writing: carbocations rearrange, and the alkyl group activates the ring, so polyalkylation can follow. To make pure n-propylbenzene, carry out Friedel-Crafts acylation with propanoyl chloride and AlCl3 to get propiophenone, then reduce it by the Clemmensen method (Zn-Hg, conc. HCl). The acylium ion does not rearrange.
Length check: a 4-mark part gets about 8.8 minutes, roughly 100 words plus equations. This answer runs past that for revision. If time is short, keep the overall equation and steps 1 to 4 in one line each; the minor-product paragraph and the acylation route are the first to drop.
Questions answered only in the full file
The remaining 21 parts of the June 2026 CHE-05 paper are listed below exactly as printed. Their answers are kept only in the full solved file.
Q1(a) Give the IUPAC and common name of the following compound: CH2OH β CHOH β CH2OH 1
Q1(b) Write the structure of two geometrical isomers of HOOC β CH = CH β COOH and give their common names. Which of these will form an anhydride? 1
Q1(c) What will be the multiplicity of the CH3 and CH2 absorption signals in the NMR spectrum of CH3CH2Cl. 1
Q1(d) Write the structure of Newman projections of n-butane. 1
Q1(e) Which of the following will have a higher melting point and why? [Structures printed in the paper: 4-aminophenol or 2-aminophenol] 1
Q2(a) What is octane number? Which hydrocarbon has been assigned a certain [octane] no. 100? 2
Q2(b) What is the major product of mononitration of naphthalene and why? 2
Q2(c) How will [you] convert CH3MgCl to ethyl methyl ketone and acetic acid? 2
Q2(d) How is phenol obtained from cumene? 2
Q2(e) Explain why pyridine is more basic than pyrrole. 2
Q2(f) Write the structure of chelate complex of 18 crown [18-crown-6] ether with KMnO4. 2
Q3(a) Explain which of the following will undergo SN1 reaction and why? C6H5CH2Cl or C6H5CH2CH2CH2Cl 3
Q3(b) Write the reaction of Azo dye test using aniline as an example. Which of the following will not give the above test? C6H5CH2NH2, [structure printed in the paper: 2-methylaniline] 3
Q3(d) What is malachite green used for? How [is] it prepared from benzaldehyde? 3
Q3(e) Write the reaction and mechanism of conversion of benzene to nitrobenzene. 3
Q3(f) A compound X on ozonolysis gives acetone only. What is X? Write all reactions. Give one method of preparation of X. 3
Q4(a) Arrange the following in an increasing order of basicity and explain your answer: [Structures printed in the paper: (i) aniline, (ii) benzene-1,4-diamine, (iii) 4-aminophenol] 4
Q4(c) (i) Write the Haworth projections of Ξ±-D(+) and Ξ²-D(+)(Glucose).
(ii) Define iodine value and give its significance. 4
Q4(d) Complete the following reactions:
(i) Rβ²(R)C=NβOH β ? Rβ²CONHR
(ii) [phenyl acetate] β ? [2-hydroxyacetophenone]
(iii) [benzoyl chloride] β ? [benzaldehyde]
(iv) [1,3-dinitrobenzene] (NaSH, CH3OH, Ξ) β ? 4
Q4(e) Taking suitable example write the mechanism of Claisen condensation. 4
Q4(f) How is ethyl magnesium chloride prepared. How will you obtain a/an: (i) Aliphatic acid (ii) Alkyl cyanide and (iii) Primary alkyl amine starting with RMgX. 4
CHE-05 Organic Chemistry syllabus block by block
CHE-05 Organic Chemistry is taught in four blocks, and IGNOU's own assignment for the course is set across all four blocks.
The block count comes from the official IGNOU CHE-05 assignment booklet 2025. Its 20 questions run in block order, five per block, so the table below groups topics the way that assignment does. Block titles follow the eGyanKosh course index for CHE-05.
| Block | Topics tested in official CHE-05 material | June 2026 parts from this block |
|---|---|---|
| Block 1: Fundamental Concepts | IUPAC naming, R/S and E/Z configuration, n-butane conformations, hydrogen bonding and acid strength | Q1(b), Q1(c), Q1(d), Q1(e) |
| Block 2: Basic Skeleton: Hydrocarbons and Heterocyclic | Alkanes and octane rating, ozonolysis of alkenes, HΓΌckel's rule and aromatic substitution, pyrrole, pyridine and furan | Q2(a), Q2(b), Q2(e), Q3(e), Q3(f), Q4(b) |
| Block 3: Derivatives of Hydrocarbons I | SN1 and SN2 reactivity of alkyl halides, crown ethers and Williamson synthesis, aldol, Cannizzaro and haloform reactions, Hell-Volhard-Zelinsky reaction | Q1(a), Q2(c), Q2(d), Q2(f), Q3(a), Q3(c), Q3(d), Q4(f) |
| Block 4: Derivatives of Hydrocarbons II | Ester condensations, nitro compounds and amine basicity, carbohydrates, lipids and nucleotides | Q3(b), Q4(a), Q4(c), Q4(e) |
Q4(d) mixes four mini-reactions that reach into Blocks 3 and 4 together, which is why it sits outside the table. If you are still building notes block by block, our CHE-05 Study Material follows the same order.
Parts per block: 4 + 6 + 8 + 4 + 1 shared (Q4(d)) = 23. Printed marks per block: Block 1 = 4, Block 2 = 16, Block 3 = 20, Block 4 = 15, shared = 4, total 59.
CHE-05 June 2026 paper pattern and marks split
The CHE-05 Question Paper for June 2026 carries 50 marks over four questions, and the marks per part rise from 1 to 4 as you move through the paper.
| Question | Parts offered | Parts to attempt | Marks | What the June 2026 parts test |
|---|---|---|---|---|
| Q1 | 5 | All 5 | 5 Γ 1 = 5 | IUPAC and common naming, butenedioic acid isomers, chloroethane NMR, Newman projections, aminophenol melting points |
| Q2 | 6 | Any 5 | 5 Γ 2 = 10 | Octane number, naphthalene nitration, Grignard conversions, cumene process, heterocycle basicity, crown ether complex |
| Q3 | 6 | Any 5 | 5 Γ 3 = 15 | Benzyl versus 3-phenylpropyl chloride in SN1, azo dye test, benzaldehyde in base, malachite green, nitration mechanism, ozonolysis to acetone |
| Q4 | 6 | Any 5 | 5 Γ 4 = 20 | Aniline basicity order, Friedel-Crafts mechanism, glucose anomers with iodine value, four reagent gaps, Claisen condensation, Grignard synthesis |
That adds up to 23 parts on the paper and 20 that you actually write. The Hindi half of the paper prints the Question 4 marks as 4Γ5=20, which is the same total. For other sessions of this course, browse our IGNOU Previous Year Question Paper section.
Printed: 5 Γ 1 + 6 Γ 2 + 6 Γ 3 + 6 Γ 4 = 59 marks. Attempted: 50. The 9 spare marks are one dropped part each in Q2 (2), Q3 (3) and Q4 (4).
Choice rule: write exactly 5 + 5 + 5 + 5 parts. A sixth part in Q4 spends about 9 minutes and cannot raise the 20-mark ceiling of that question.
Time efficiency: Q1 is five recall items (a name, two structures, a splitting pattern, one melting-point reason). At about a minute each you bank 5 marks in 5 minutes against a 11-minute budget, freeing roughly 6 minutes for the Q4 mechanisms.
Most repeated CHE-05 important questions topics
Geometrical isomerism, glucose ring structures and spectroscopy appeared in every one of the five official CHE-05 papers we could read, from June 2023 to June 2026.
We counted topics in the June 2023, December 2023, June 2025, December 2025 and June 2026 papers taken from webservices.ignou.ac.in and ignou.ac.in. The June 2024 and December 2024 files on the IGNOU site are scanned images without readable text, so they are not counted here.
In the table below, the count covers only the four papers before June 2026, and June 2026 sits in its own column. That way a topic's history is not inflated by the paper being tested against it, and the one tracked topic that June 2026 skipped stands out.
| Topic | Where it appeared earlier | Earlier papers (of 4) | In June 2026? |
|---|---|---|---|
| Geometrical isomerism and E/Z or cis/trans structures | J23 1(e), D23 1(d), J25 1(a), D25 1(a) and 2(e) | 4 of 4 | Yes, Q1(b) |
| Glucose ring forms: Haworth, chair form, mutarotation | J23 2(f), D23 2(e), J25 2(f), D25 2(a) | 4 of 4 | Yes, Q4(c)(i) |
| NMR, IR and UV spectroscopy | J23 2(a), D23 2(a), J25 2(b), D25 2(d) and 3(f) | 4 of 4 | Yes, Q1(c) |
| Pyrrole and pyridine: basicity and substitution position | J23 3(a), J25 3(d), D25 3(a) | 3 of 4 | Yes, Q2(e) |
| Aromatic nitration and substitution in benzene, phenol, naphthalene | J23 4(f), D23 4(b), J25 3(f) | 3 of 4 | Yes, Q2(b) and Q3(e) |
| Ozonolysis and alkene structure deduction | J23 4(d), J25 4(d), D25 2(e) | 3 of 4 | Yes, Q3(f) |
| Amines: basicity, diazotisation, Hinsberg and azo tests | J23 4(e)(i), D23 1(a) and 3(d), J25 4(f) | 3 of 4 | Yes, Q3(b) and Q4(a) |
| Fats and fuels terms: iodine value, saponification value, octane and cetane number | J23 3(f), D23 2(d) and 4(e)(ii), J25 2(e) | 3 of 4 | Yes, Q2(a) and Q4(c)(ii) |
| Conformations of n-butane and dimethylcyclohexanes | J25 4(e), D25 4(a) | 2 of 4 | Yes, Q1(d) |
| Phenol from benzene by the cumene route | J23 3(e)(i), D23 3(f) | 2 of 4 | Yes, Q2(d) |
| Aldol and Cannizzaro reactions | J25 2(c), D25 2(c) | 2 of 4 | Yes, Q3(c), shown above |
| Hofmann bromamide rearrangement of amides | J23 4(b), J25 4(c) | 2 of 4 | No |
| m-Dinitrobenzene reactions | J23 4(c) | 1 of 4 | Yes, Q4(d)(iv) |
| Grignard reagent preparation and conversions | D23 3(c) | 1 of 4 | Yes, Q2(c) and Q4(f) |
| Friedel-Crafts alkylation and propylbenzene routes | D23 2(c)(ii) | 1 of 4 | Yes, Q4(b), shown above |
| Claisen ester condensation and ethyl acetoacetate | J25 3(b) | 1 of 4 | Yes, Q4(e) |
| Crown ethers | D23 3(e)(ii) | 1 of 4 | Yes, Q2(f) |
The pattern is clear: structure questions dominate the 1 and 2-mark parts, while mechanisms carry the 4-mark parts. For a wider list across courses, see our IGNOU Solved Guess Paper collection.
Hit rate: of the 12 topics with two or more earlier appearances, 11 came back in June 2026 = 92%. The only miss is the Hofmann bromamide rearrangement.
Size of the return: the three 4-of-4 topics came back small. Geometrical isomerism and NMR returned only as 1-mark Q1 items, and glucose rings as half of a 4-mark part. Conformations, a 4-mark Q4 topic both earlier times, came back as the 1-mark Q1(d).
Position: geometrical isomerism has sat in Q1 in all five papers. Spectroscopy and glucose rings sat in Q2 in all four earlier papers; June 2026 moved spectroscopy down to Q1 and glucose up to Q4. Hofmann bromamide was a Q4 part both times it appeared.
Session split: the readable window is two June papers (2023, 2025) and two December papers (2023, 2025). That is balanced but too small to lean on. The only topic scoring zero on one side is Hofmann bromamide (2 of 2 June, 0 of 2 December), and it then missed June 2026 as well, so no session pattern is claimed here.
Which blocks could answer the June 2026 paper
Using the block placement in the file index below, here is how far each combination of blocks would carry a student in June 2026, respecting the choice rule (all of Q1, any five of six in Q2, Q3 and Q4). Q4(d) is counted as 1 mark per reaction: (ii) and (iii) from Block 3, (i) and (iv) from Block 4.
| Blocks studied | Q1 | Q2 | Q3 | Q4 | Ceiling |
|---|---|---|---|---|---|
| Blocks 2, 3 and 4 (Block 1 left out) | 1 | 10 | 15 | 20 | 46 |
| Blocks 1, 3 and 4 (Block 2 left out) | 5 | 6 | 12 | 20 | 43 |
| Blocks 1, 2 and 3 (Block 4 left out) | 5 | 10 | 15 | 10 | 40 |
| Blocks 1, 2 and 4 (Block 3 left out) | 4 | 6 | 9 | 18 | 37 |
| Blocks 3 and 4 only | 1 | 6 | 12 | 20 | 39 |
| Blocks 2 and 3 only | 1 | 10 | 15 | 10 | 36 |
Block 3 was the costliest to miss: leaving it out drops the ceiling to 37, against 46 for leaving out Block 1. It fed 8 of the 23 parts and 20 of the 59 printed marks.
Q4, the 20-mark question, could be answered in full from Blocks 3 and 4 alone: Q4(a), (c) and (e) from Block 4, Q4(f) from Block 3, and Q4(d) across both.
Block 1 fed only the four 1-mark parts Q1(b) to Q1(e), so it carried 4 printed marks. Those marks are compulsory and quick, which makes Block 1 cheap to revise rather than safe to skip.
One caveat: Q1(a) asks for an IUPAC and common name, which is a Block 1 skill in the assignment even though the compound (a polyhydric alcohol) is Block 3 content. If you place Q1(a) in Block 1, the first row falls to 45 and the Block 3 conclusions do not change.
What the 2025 assignment predicted
The 2025 CHE-05 assignment has 20 questions. Eight of them have a direct counterpart in the June 2026 paper: naming (assignment Q1 β Q1(a)), n-butane conformations (Q3 β Q1(d)), hydrogen bonding (Q4 β Q1(e)), ozonolysis (Q7(b) β Q3(f)), Friedel-Crafts limits (Q9(a) β Q4(b)), pyrrole and pyridine basicity (Q10(c)(ii) β Q2(e)), the Claisen reaction (Q12(c) β Q4(e)) and anilinium basicity (Q19 β Q4(a)).
Assignment-to-paper hit rate: 8 of 20 questions = 40%. Friedel-Crafts and Claisen had only one earlier exam appearance each, yet both sat in the assignment and both came back as 4-mark mechanisms.
Watch one line in that booklet: assignment Q10(c)(ii) is printed as "Pyrrole is more basic than pyridine", which is the wrong way round. The June 2026 paper asks the correct version, why pyridine is more basic than pyrrole, so do not learn the assignment wording as a fact.
December 2026 shortlist: what June 2026 left out
These are the topics with the strongest case for December 2026, ranked by earlier exam count, whether the 2025 assignment asked them, and whether June 2026 tested only half of their unit.
- Hofmann bromamide rearrangement. 2 of 4 earlier papers, both times as a 4-mark Q4 part, and the only tracked repeat that June 2026 skipped. June 2026 asked the Beckmann rearrangement in Q4(d)(i), its sister amide reaction, so the unit was open but this reaction stayed out.
- SN2 reactivity order of alkyl halides. A full 5-mark assignment question (Q11). June 2026 asked only the SN1 side in Q3(a), so the SN2 half of the unit is unexamined.
- IR and UV spectroscopy as a 2-mark part. Spectroscopy was a Q2 part in all four earlier papers. June 2026 gave it only a 1-mark NMR splitting item, leaving IR and UV untested.
- Stereoisomers: enantiomers, diastereomers and R/S. Assignment Q2 (stereoisomers of 2,3-pentanediol). June 2026 tested only E/Z isomerism in Q1(b).
- Haloform reaction mechanism. Assignment Q14. June 2026 drew aldol and Cannizzaro from the same carbonyl unit but not the haloform reaction.
- Hell-Volhard-Zelinsky reaction. Assignment Q15, untouched in June 2026.
- Williamson ether synthesis. Assignment Q13. The ethers unit fed only the crown ether part Q2(f).
- Nucleotides and DNA structures. Assignment Q20. June 2026 took carbohydrates and lipids from the biomolecules unit but not nucleotides.
- HΓΌckel's rule and furan reactivity. Assignment Q9(c) and Q10(c)(i). June 2026 used the heterocycles only for basicity.
Items 2 and 4 to 9 rest on the assignment and on half-tested units; their own exam counts across June 2023 to December 2025 are not in the table above, so check those four papers before relying on the order.
How our CHE-05 Organic Chemistry answers are written and checked
Every CHE-05 answer is written by a chemistry subject expert, sized to its marks, and checked by our reviewer before it goes into the file.
Mechanisms are written as numbered steps that name each intermediate, whether that is an arenium ion, an enolate or a tetrahedral alkoxide. Reaction answers give balanced equations with the reagent and condition above the arrow, because a missing catalyst such as AlCl3 or a missing temperature condition is where students lose marks.
Length follows the paper: a line or two for 1-mark parts, a short reasoned note for 2 marks, an explanation plus equation for 3 marks and a full mechanism or multi-part answer for 4 marks. Structures such as Newman projections and Haworth rings are drawn, not described.
| Marks per part | Parts you write | Minutes per part | Words per part | Total minutes |
|---|---|---|---|---|
| 1 | 5 | 2.2 | about 25 | 11 |
| 2 | 5 | 4.4 | about 50 | 22 |
| 3 | 5 | 6.6 | about 75 | 33 |
| 4 | 5 | 8.8 | about 100 | 44 |
110 minutes Γ· 50 marks = 2.2 minutes a mark. At 11 to 12 handwritten words a minute that is about 25 words a mark, and equations and structures come out of the same budget, so treat these word counts as ceilings.
Facts are checked against IGNOU course material and standard organic chemistry texts. The draft is then reviewed by Sheetal Kirola, reviewer at Unnati Educations, who checks reaction direction, product naming and the marks-to-length fit.
CHE-05 solved file index: all 23 parts
The CHE-05 solved file answers all 23 parts of the June 2026 paper: 2 are on this page and 21 are in the full file only.
CHE-05 is a theory course, so instead of a practical record index this table maps each part to its marks, topic area and the block we place it in. Block placement follows the order of the official assignment.
| Part | Marks | Topic area | Block (by assignment order) | Answer |
|---|---|---|---|---|
| Q1(a) | 1 | IUPAC and common naming | Block 3 | Full file only |
| Q1(b) | 1 | Geometrical isomerism of a dicarboxylic acid | Block 1 | Full file only |
| Q1(c) | 1 | NMR signal splitting | Block 1 | Full file only |
| Q1(d) | 1 | Conformations of n-butane | Block 1 | Full file only |
| Q1(e) | 1 | Melting point comparison | Block 1 | Full file only |
| Q2(a) | 2 | Fuel rating of alkanes | Block 2 | Full file only |
| Q2(b) | 2 | Substitution in naphthalene | Block 2 | Full file only |
| Q2(c) | 2 | Grignard reagent conversions | Block 3 | Full file only |
| Q2(d) | 2 | Industrial preparation of phenol | Block 3 | Full file only |
| Q2(e) | 2 | Basicity of heterocycles | Block 2 | Full file only |
| Q2(f) | 2 | Crown ether complexes | Block 3 | Full file only |
| Q3(a) | 3 | SN1 reactivity of alkyl halides | Block 3 | Full file only |
| Q3(b) | 3 | Azo dye test for amines | Block 4 | Full file only |
| Q3(c) | 3 | Aldol and Cannizzaro reactions | Block 3 | On this page |
| Q3(d) | 3 | Dye preparation from benzaldehyde | Block 3 | Full file only |
| Q3(e) | 3 | Electrophilic nitration | Block 2 | Full file only |
| Q3(f) | 3 | Ozonolysis structure deduction | Block 2 | Full file only |
| Q4(a) | 4 | Basicity of substituted anilines | Block 4 | Full file only |
| Q4(b) | 4 | Friedel-Crafts alkylation | Block 2 | On this page |
| Q4(c) | 4 | Glucose anomers and oils | Block 4 | Full file only |
| Q4(d) | 4 | Four reagent-identification parts | Blocks 3 and 4 | Full file only |
| Q4(e) | 4 | Ester condensation mechanism | Block 4 | Full file only |
| Q4(f) | 4 | Grignard reagent synthesis | Block 3 | Full file only |
2 on this page + 21 in the full file = 23 parts; 2 + 21 matches the 5 + 6 + 6 + 6 parts printed.
Programmes that include CHE-05 Organic Chemistry
CHE-05 Organic Chemistry is an elective course in the IGNOU B.Sc. under the Bachelor's Degree Programme, studied by learners who pick chemistry as one of their science disciplines.
Under the IGNOU Bachelor of Science (BSC) rules printed in the official booklet, you take 56 to 64 elective credits from two to four of physics, chemistry, life sciences and mathematics, with 8 to 48 credits from any one discipline.
At least 25 percent of your elective credits in chemistry, physics and life sciences must come from laboratory courses, which is why CHE-05 is usually paired with chemistry lab courses. Learners in the newer BSCG scheme study organic chemistry under BCHCT course codes instead.
How to get the full CHE-05 Solved Question Paper on WhatsApp
Message WhatsApp 9899436384 with the code CHE-05 and the June 2026 session, and our team will share the complete solved file with all 23 answers.
The file includes the 2 answers above plus the 21 answers not shown here, from the naming part in Q1(a) to the Grignard synthesis in Q4(f). The IGNOU CHE-05 Solved Question Paper is prepared as a PDF that you can read on your phone or print.
If you are also writing the December 2026 exam, mention it in your message so we can tell you which repeat topics from this paper deserve the most revision time.
CHE-05 Organic Chemistry FAQs
What is the CHE-05 Solved Question Paper June 2026?
It is the official IGNOU June 2026 CHE-05 Organic Chemistry term-end paper with every one of its 23 parts answered by our chemistry team. Each answer follows the marks printed on the paper, so 1-mark parts stay short while 4-mark parts carry full mechanisms, equations and structures. Two answers are shown on this page and the complete solved file is shared on WhatsApp 9899436384.
How many questions are in the IGNOU CHE-05 Question Paper for June 2026?
The June 2026 CHE-05 paper has four main questions split into 23 parts. Question 1 has five compulsory 1-mark parts, while Questions 2, 3 and 4 each offer six parts, of which you attempt five, worth 2, 3 and 4 marks. You answer 20 parts for 50 marks in 2 hours, but our file solves all 23 so you can practise every option.
How do I get the full CHE-05 Organic Chemistry solved file on WhatsApp?
Send a WhatsApp message to 9899436384 with the course code CHE-05 and the June 2026 session. Our team replies with the file details and the next steps. The complete file answers all 23 parts of the paper: the 2 answers you can read on this page plus the 21 answers that are kept only in the full file, written to the marks shown.
Which CHE-05 Organic Chemistry topics repeat most in IGNOU exams?
Across the five official CHE-05 papers we studied, from June 2023 to June 2026, geometrical isomerism, glucose ring structures and spectroscopy appeared in all five. Pyrrole and pyridine chemistry, aromatic nitration, ozonolysis, amine reactions and fats and fuels terms such as iodine value appeared in four. Our solved answers give these repeat topics the most depth and the clearest structures.
Are the CHE-05 answers written to IGNOU marking standards?
Yes. Every CHE-05 answer is matched to the marks printed against it. Reaction questions carry balanced equations with reagents and conditions, mechanism questions show each step with the intermediate formed, and structure questions include clearly labelled structures. Answers are written by our chemistry team and reviewed by Sheetal Kirola, reviewer at Unnati Educations, before the file is shared with any student.
Is CHE-05 Organic Chemistry a theory or a practical course?
CHE-05 Organic Chemistry is a theory course in the IGNOU B.Sc. programme. It is assessed through one tutor-marked assignment carrying 30 percent weightage and a two-hour term-end examination for 50 marks. Chemistry laboratory work is done through separate lab courses, so this solved file focuses on written answers, reaction mechanisms and structures rather than practical records.
Can I use the CHE-05 solved paper to prepare for the December 2026 exam?
Yes, that is the main use of the file. Topics such as aromatic substitution, heterocyclic basicity, carbonyl reactions and carbohydrate structures return session after session in CHE-05, so practising complete answers from June 2026 prepares you for similar questions. Pair the solved paper with your block study material and the assignment for full coverage before the December 2026 term-end exam.
Who prepared these CHE-05 answers
The CHE-05 answers on this page and in the full file were written by the Unnati Educations chemistry team, working from the official June 2026 paper, the four earlier readable CHE-05 papers from June 2023 to December 2025, and IGNOU's 2025 CHE-05 assignment booklet.
Prateek Talwar, Academic Head at Unnati Educations, led the analysis on this page: restating the repeat table over the four earlier papers so the June 2026 paper is not counted inside its own window, working out which block combinations could have answered the paper (Blocks 3 and 4 alone cover all of Q4; leaving out Block 3 costs the most), matching the 2025 assignment against the June 2026 paper (8 of 20 questions), and building the December 2026 shortlist and the marks-to-minutes table.
Sheetal Kirola reviewed the page. She checked that 5 + 6 + 6 + 6 parts give 59 printed marks against 50 attempted, that the block counts add to 23 parts, every row of the repeat table against the sessions listed, the balanced Cannizzaro equation, cumene as the major Friedel-Crafts product and the Clemmensen route to n-propylbenzene, the 3-phenylpropyl chloride in Q3(a), the placement of the Hell-Volhard-Zelinsky reaction in Block 3 of the assignment, and the elective-credit rules against the 2025 booklet.