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Question

Alcoholic solution of 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

Dehydrohalogenation


The explanation for the correct answer

Option (D) Dehydrohalogenation.

  • Alcoholic solution of 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 KOHeliminates 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) Dehydrogenation

  • Dehydrogenation 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 KOH is a specific reagent for dehydrohalogenation, option (D) is the correct answer.


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