Among the following, which is the most reactive towards alcoholic KOH

C H_{3} C H_{2} C H_{2} B r

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C H_{3} C O C H_{2} C H_{2} B r

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C H_{3} C H_{2} B r

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C H_{2} = C H B r

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Solution

The correct option is A $C H_{3} C H_{2} C H_{2} B r$
The polarity between C-X bond increase by increasing the +I effect, which increases by increasing the alkyl group by which X of C-X is easily eliminated. In $C H_{3} C H_{2} C H_{2} B r$ ,
$C H_{3} C H_{2} C H_{2} B r + K O H a l c . - - \to C H_{3} C H = C H_{2} + K B r + H_{2} O$

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