Haloalkane in the presence of alcoholic $K O H$ undergoes:

elimination

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polymerisation

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dimerisation

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substitution

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Solution

The correct option is A elimination

Haloalkanes in the presence of alcoholic KOH undergoes elimination reaction or dehydrohalogenation reaction.
$C H_{3} C H_{2} C H_{2} B r + a l c . K O H \to C H_{3} C H = C H_{2} + K B r + H_{2} O$

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