Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces

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4-phenycylclopentene

3-phenylcyclopentene

2-phenylcyclopentene

1-phenylcyclopentene

answer is A.

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Detailed Solution

The involved reaction is

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We can see that the H and Br are same side, Hence elimination is difficult. Trnas-2-phenyl-1-Bromo cyclo pentane

Structure is as follows :

halo alloane treatment with dlcoholic KOH results in E2 anti-elimination mechanism

Anti elimination means H and Br both departing groups must be present at dihedral angle 1800 (anti).

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