UPSC Civil Services (Mains), Chemistry optional · 2024 · Paper II
Q4(a)(i). Furan with acetic anhydride and BF₃
Question
Consider the following reaction: [furan] + (CH₃CO)₂O, BF₃, CH₃COOH → X. Name the product X and outline the mechanism indicating the rate-determining step.
Model answer
The free solution for 2024 answers questions 1, 3, 5, 6 and 8, the ones picked in its time plan. Question 4 is answered in full in the Chemistry Paper II, 2021 to 2025 book, with every part of every paper.
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UPSC Civil Services (Main) Chemistry Paper II: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Mechanisms drawn out and labelled on the scheme
- Topic-wise weightage and a topic-wise index
CoversfuranFriedel–Crafts acylationelectrophilic aromatic substitutionacylium ion2-acetylfuran
All parts of Question 4
- 4(a)(i) Furan with acetic anhydride and BF₃10 marks
- 4(a)(ii) Major products and mechanism type5 marks
- 4(b)(i) Crossover experiment for the Claisen rearrangement10 marks
- 4(b)(ii) Energy profile: benzene to chlorobenzene5 marks
- 4(c)(i) Major products of three rearrangements10 marks
- 4(c)(ii) Chlorodifluoromethyl phenyl ketone with Ac₂O / AcONa10 marks