Identify 'A' in the following reaction. A Lithium amide Ethynyl lithium Bromoethane But-1-yne

MHT CET 2025 Chemistry question

Identify 'A' in the following reaction.

(A)Ethene
(B)EthyneCorrect
(C)But-1-ene
(D)But-2-ene

Answer: (B)

Solution

Terminal alkynes are weakly acidic (sp-hybridised C-H), so a strong base such as lithium amide () removes the acidic proton: HC\equiv CH + LiNH_2 \rightarrow HC\equiv C^-Li^+ + NH_3. The ethynyl lithium acts as a nucleophile

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Question ID VK-102657