JEE Main Chemistry question

Consider the alkyne CH–CC–CH (but-2-yne). Which set of reaction conditions converts it predominantly into the *cis*-alkene shown?

(A)H/NiB (P-2 nickel boride) or H/Pd–CaCO in quinoline (Lindlar's)Correct
(B)Na/NH(l) or LiAlH
(C)Both (A) and (B)
(D)None of these

Answer: (A)

Solution

*Syn* (*cis*)-selective semihydrogenation of an internal alkyne is achieved by a poisoned heterogeneous catalyst — either Lindlar's catalyst (Pd–CaCO/quinoline) or the related nickel boride (P-2, NiB) catalyst — both of which

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Question ID VK-142452