UPSC Civil Services (Mains), Chemistry optional · 2021 · Paper II
Q6(a)(i). Product of acetone with dilute sodium hydroxide from its spectra
Question
IR: 1620 cm⁻¹ and 1695 cm⁻¹; ¹H NMR: δ 1.9 (s, 3H), 2.1 (s, 6H), 6.15 (s, 1H). The molecule obtained on treatment of acetone with dilute sodium hydroxide exhibits the above spectral data. Propose the structure of this molecule.
Model answer
The free solution for 2021 answers questions 1, 2, 3, 5 and 8, the ones picked in its time plan. Question 6 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
Coversaldol condensationacetonemesityl oxideα,β-unsaturated ketonestructure from spectra
All parts of Question 6
- 6(a)(i) Product of acetone with dilute sodium hydroxide from its spectra15 marks
- 6(a)(ii) Higher carbonyl stretching frequency in two pairs5 marks
- 6(b) Interactions that stabilise a protein, with the residues involved15 marks
- 6(c) I Photolysis of 2-cyclopropylcyclohexanone5 marks
- 6(c) II Photolysis of 1,1,3-triphenylpropan-2-one10 marks