If you are preparing for IGNOU BCHET-147, this is the actual BCHET 147 Question Paper December 2025. It covers organometallic compounds, bioinorganic chemistry, UV-Vis and IR spectroscopy. Knowing the real paper helps you understand what IGNOU expects and how to structure your answers for maximum marks.
Download Now — Get BCHET-147 Solved Question Paper December 2025 IGNOU
The BCHET-147 solved question paper from Unnati Education gives you complete answers written in proper IGNOU format. Each answer is crafted with the level of detail IGNOU examiners look for. Whether you need the IGNOU BCHET-147 question paper for revision or for understanding answer-writing style, this is the resource that actually helps.
What is BCHET 147 Question Paper December 2025?
The BCHET 147 December 2025 question paper is the official IGNOU Term-End Examination paper for the BSCG and BSCM programmes, covering organometallics, bioinorganic chemistry, polynuclear hydrocarbons, UV-Vis and IR spectroscopy, carrying 50 marks in a 2-hour descriptive format.
This paper is part of the Bachelor of Science (General) curriculum under IGNOU. It tests students on both theoretical chemistry concepts and applied spectroscopic analysis. The questions range from reaction mechanisms to biological roles of metals, making it one of the more comprehensive chemistry papers in the BSCG programme.
About This Solved Paper
| Prepared by | Unnati Education, IGNOU-experienced academic content writer. |
| Qualification | Graduate with specialization in Chemistry and Inorganic Chemistry. |
| Programme | IGNOU Bachelor of Science General (BSCG) and Bachelor of Science Multidisciplinary (BSCM) |
| Institution Reference | IGNOU Term-End Examination December 2025. |
About IGNOU BCHET-147 — Organometallics, Bioinorganic Chemistry and Spectroscopy
BCHET-147 is one of those subjects where students either find it deeply interesting or completely overwhelming. The paper has two distinct halves. Part A deals with organometallic chemistry including transition metal compounds, ferrocene, metal carbonyls and the role of metals in biological systems. Part B moves into organic territory with polynuclear hydrocarbons, Diels-Alder reactions and detailed spectroscopy.
Here is the important part. Spectroscopy questions in Part B are not just theoretical. IGNOU expects you to assign IR frequencies, explain electronic transitions and interpret molecular structures. That requires practice with real questions, which is exactly what this paper offers.
BCHET 147 Exam Pattern and Marks Breakdown
Part A carries 25 marks and covers Organometallics and Bioinorganic Chemistry. Part B carries 25 marks and covers Polynuclear Hydrocarbons along with UV-Vis and IR Spectroscopy. Students must attempt five questions from each part. Total marks are 50. Duration is 2 hours. Both parts require separate answer sheets.
All Questions — BCHET 147 Question Paper December 2025 IGNOU
Part A — Organometallics and Bioinorganic Chemistry
- What are the reduction products of KMnO4 in (i) Acidic medium, (ii) Alkaline medium, and (iii) Neutral medium? Find the oxidation state of manganese and KMnO4 and all the above reduction products.
- Explain why the transition metal organometallic compounds have immense variety in their structure and bonding types. Why are organometallic compounds good catalysts in chemical industry?
- Or — What are the two possible structures of ferrocene? Draw the structures for both and give two differences.
- "All Ni-C bond lengths in Ni(CO)4 are identical but Fe-C bond lengths in Fe(CO)5 are not identical." Explain this statement with respect to valence bond approach and give the structures for both.
- How will you classify the elements on the basis of mechanism of action in biological systems? Give suitable examples of each class.
- What purpose does magnesium serve in the process of photosynthesis? Give the net reaction in photosynthesis.
- Which heavy metal was responsible for Itai-Itai disease in Japan? What was the source of the disease? Name two antidotes for the above metal.
- Which metal is present in hemoglobin and myoglobin? Give four differences between them.
Part B — Polynuclear Hydrocarbons and UV-Vis, IR Spectroscopy
- (a) What are active methylene compounds? Explain keto-enol tautomerization. (b) Explain Claisen ester condensation for the synthesis of any 3-oxo-esters.
- (a) Give the IUPAC name of the following compounds [structures as shown in paper]. (b) Assign [A] and [B] in the following reaction with their names [naphthalene oxidation with V2O5].
- (a) Give the reaction when maleic anhydride reacts with pyrrole and furan. (b) Explain the properties of polycyclic aromatic hydrocarbons.
- (a) Explain various electronic transitions involved in UV spectroscopy with suitable example from a small organic molecule. (b) Explain Beer-Lambert's law of absorption.
- (a) Assign the stretching frequencies for a particular functional group in the given compound [structure shown in paper with NH2, C=O, C≡C-H groups]. IR stretching frequencies (in cm-1): 3500, 3400, 3309, 3040, 2960-2851, 2120, 1720. (b) Which molecule will absorb at longer wavelength? Explain [structures A and B shown in paper].
- (a) Explain normal modes of vibrations for a polyatomic molecule. (b) Arrange the following functional groups in increasing order of their C=O stretching absorption frequencies: (i) Acid chlorides (ii) Esters (iii) Amides (iv) Anhydrides.
- (a) Complete the following reactions and assign [A], [B] and [C] along with their names: (i) Pyridine with Br2 at 575K giving [A] and [B] (ii) Furan with SO3 in Pyridine giving [C]. (b) Write a reaction when ethyl-3-oxobutanoate is treated with chloropropanone in presence of pyridine and also name the product formed.
BCHET 147 Syllabus Topics Covered
This paper touches every major topic in the BCHET-147 syllabus. Organometallic chemistry forms the backbone of Part A, with questions on metal carbonyls, ferrocene and catalysis. Bioinorganic chemistry brings in real-world relevance through hemoglobin, photosynthesis and environmental toxicology. Part B covers polynuclear hydrocarbons including aromatic systems and Diels-Alder reactions. UV-Vis spectroscopy and IR spectroscopy are both tested through application-based questions.
Sample Answer Preview — BCHET 147 Solved Question Paper Explanation
Beer-Lambert's law states that the absorbance of a solution is directly proportional to both the concentration of the absorbing species and the path length of light through the solution. Mathematically, A = εcl, where A is absorbance, ε is the molar absorption coefficient, c is concentration and l is path length. This law applies when monochromatic light is used and the solution is homogeneous. Most students notice this question appears regularly in IGNOU spectroscopy papers, making it a must-prepare topic. Get the complete BCHET-147 solved question paper for detailed answers to all remaining questions.
How to Write High-Scoring Answers in BCHET 147 exam
IGNOU examiners reward clarity and structure. For organometallic questions, always draw structures alongside your explanation. For spectroscopy answers, mention specific wavenumber ranges when assigning IR frequencies. In bioinorganic chemistry questions, state the biological significance explicitly. That is what separates average answers from scoring ones. Reaction mechanisms should show arrow-pushing or stepwise logic. Never write a wall of text for a 5-mark question. Break it into defined points with brief explanations.
Who Should Use This BCHET-147 Solved Question Paper December 2025?
This resource is built for IGNOU BSCG and BSCM students appearing in their chemistry papers. It is equally useful for students who are re-appearing in BCHET-147 and want to understand where they went wrong previously. If spectroscopy or organometallics has been a weak area for you, working through this solved paper with proper answer explanations will genuinely change how you approach the exam.
Why This Is Better Than Free BCHET-147 December 2025 Question Paper PDFs and Telegram Files
Free PDFs floating around on Telegram often have no answers, outdated solutions or incorrect explanations. In practice, a question paper without a solved answer is only half useful. Unnati Education provides answers verified against IGNOU syllabus content, complete with diagrams and proper format. That is what makes the difference when you sit down to write your exam.
Student Reviews — BCHET-147 Solved Question Paper by Unnati Education
"The BCHET-147 December 2025 solved paper from Unnati was exactly what I needed. The spectroscopy answers were very clearly explained." — Priya S., IGNOU BSCG Student
"I was confused about the organometallic bonding questions. This solved paper cleared everything up before my exam." — Rahul M., IGNOU Chemistry Student
How to Get the BCHET-147 Solved Question Paper December 2025 — Step by Step
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Frequently Asked Questions
What is BCHET-147?
BCHET-147 is an IGNOU chemistry course for BSCG and BSCM students covering organometallics, bioinorganic chemistry, polynuclear hydrocarbons and UV-Vis and IR spectroscopy. It is a Term-End Examination paper carrying 50 marks and forms a core part of the Bachelor of Science General programme under IGNOU.
What is the exam pattern and marks distribution?
The paper carries 50 marks total. Part A covers Organometallics and Bioinorganic Chemistry for 25 marks. Part B covers Polynuclear Hydrocarbons and Spectroscopy for 25 marks. Students attempt five questions from each part. Separate answer sheets are required. The total duration is 2 hours and all questions carry equal marks within each part.
Which spectroscopy topics are most important?
Beer-Lambert's law, electronic transitions in UV spectroscopy, IR stretching frequencies for functional groups and normal modes of vibration are consistently tested. Students should be comfortable assigning IR frequencies to specific groups like NH2, C=O, C≡C and aromatic CH. These topics appear directly in this December 2025 paper.
How can I download the IGNOU BCHET-147 question paper?
You can get the BCHET-147 December 2025 question paper with solved answers directly from Unnati Education. Contact us through the website or WhatsApp, mention your course and examination session, and receive the complete solved material. Official unsolved question papers are also available through the IGNOU official website after the examination.
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