[A] Lindlar's catalyst CH_3-C C-CH_3 [ liq. NH _3] Na [B]. [A] and [B] are respectively [DCE 2005]

JEE Main Chemistry question

. and are respectively [DCE 2005]

(A)*cis*, *trans*-2-buteneCorrect
(B)Both *trans*-2-butene
(C)*trans*, *cis*-2-butene
(D)Both *cis*-2-butene

Answer: (A)

Solution

Lindlar's catalyst (Pd poisoned with Pb/quinoline) hydrogenates an alkyne by *syn* addition of H, giving the *cis*-alkene ( = *cis*-2-butene). Na in liquid

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Question ID VK-142224