Question

# Alcoholic solution of $\mathrm{KOH}$ is a specific reagent for

A

Dehydration

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B

Dehalogenation

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C

Dehydrogenation

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D

Dehydrohalogenation

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Solution

## The correct option is D DehydrohalogenationThe explanation for the correct answerOption (D) Dehydrohalogenation.Alcoholic solution of $\mathrm{KOH}$ is a specific reagent for Dehydrohalogenation of haloalkane and results in the formation of Alkenes.Reaction mechanism:In the above reaction of bromine and beta, hydrogen is eliminated to form ethene.The explanation for incorrect answers (A) Dehydration:Dehydration is the process of removal of water from the reactant, alcoholic $\mathrm{KOH}$eliminates one molecule of halogen acid to form alkene hence, option A is incorrect.(B) Dehalogenation Dehalogenation is the process of removal of halogen from the alkane derivative. Hence, option b is incorrect. (C) DehydrogenationDehydrogenation is the process by which hydrogen is removed from an organic compound to form a new chemical compound, since in the reaction halogen is removed, therefore option c is incorrect. Alcoholic solution of $\mathrm{KOH}$ is a specific reagent for dehydrohalogenation, option (D) is the correct answer.

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