What are X and Y respectively, in the following reaction? H_3C-C C-CH_3 [X] (syn product, Z-alkene) and [Y] (anti product, E-alkene)

JEE Main Chemistry question

What are and respectively, in the following reaction? and

Answer: (B)

Lindlar-type catalytic hydrogenation (Pd/BaSO poisoned catalyst + H) delivers H to the same face (*syn* addition), giving the *cis* (*Z*)-alkene.

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Question ID VK-142234