UPSC Civil Services (Mains), Chemistry optional · 2022 · Paper II
Q7(b)(ii). But-2-yne with sodium in liquid ammonia
Question
Complete the following reaction and give a suitable mechanism for the formation of the product: (ii) but-2-yne with Na in liquid NH₃.
Model answer
The free solution for 2022 answers questions 1, 4, 5, 6 and 8, the ones picked in its time plan. Question 7 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
CoversBirch-type reductiondissolving metal reductionNa in liquid NH₃trans-alkeneradical anion
All parts of Question 7
- 7(a) Secondary structures of proteins compared with tertiary structure15 marks
- 7(b)(i) Butanoyl chloride with 2 NaBH₄, then H₃O⁺10 marks
- 7(b)(ii) But-2-yne with sodium in liquid ammonia5 marks
- 7(c)(i) Compound A (M = 102) and its cleavage products B and C10 marks
- 7(c)(ii) Three isomeric carbonyl compounds C₅H₁₀O10 marks