JEE Main Chemistry question

*trans*-2-Phenyl-1-bromocyclopentane, on reaction with alcoholic KOH, gives predominantly

(A)4-Phenylcyclopentene
(B)2-Phenylcyclopentene
(C)1-PhenylcyclopenteneCorrect
(D)3-Phenylcyclopentene

Answer: (C)

Solution

E2 elimination requires an anti-periplanar relationship between the leaving bromide and the -hydrogen removed; in the *trans*-disubstituted cyclopentane, this geometry is accessible

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Question ID VK-142593