Reaction of trans- 2- phenyl-1-bromocyclopentane on reaction with alcoholic $K O H$ gives:

4-Phenylcyclopentene

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3-Phenylcyclopentene

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2-Phenylcyclopentene

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1-Phenylcyclopentene

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Solution

The correct option is B 3-Phenylcyclopentene
The reaction goes through $E_{2}$ pathway in which $β$ -elimination occurs where $H$ and $B r$ groupos are trans to each other.

Hence the product will be 3-phenylcyclopentene

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