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Which one of the following alkyl halide is most reactive towards dehydrohalogenation when heated with alc.KOH?

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${CH}_{3} - {CH}_{2} - {CH}_{2} - Br$

$({CH}_{3})_{3} C - Br$

$({CH}_{3})_{2} CH - Br$

${CH}_{3} - {CH}_{2} - Br$

answer is B.

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Detailed Solution

Mechanism involved is $E_{2}$ .
Alkene like transition state is formed.

Alkene containing more number of hyper conjugated H-atoms is formed as major product.

More number of alkyl groups on $α$ -Carbon gives more stable transition state.

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