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Addition of Halogen Acid for Alkynes

The intermedi...

Question

The intermediate formed when $C l_{2}$ reacts with benzene in presence of $A l C l_{3}$ is:

A

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B

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C

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D

(a) and (b) both can be formed

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Solution

The correct option is A
Electrophilic Substitution Mechanism for Halogenation:
Formation of an arenium ion (intermediate):

This intermediate is partially resonance stabilized as shown:

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Addition of Halogen Acid for Alkynes

Standard XII Chemistry

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