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Question

Which one of the following cannot give friedel craft's reaction?

A
Toluene
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B
Benzene
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C
Benzoic acid
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D
Benzaldehyde
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Solution

The correct option is C Benzoic acid
Carboxylic acids do not undergo ​Friedel-Craft reaction because the ​carboxyl group is deactivating, and the catalyst AlCl3 (Lewis acid) gets bonded to the carboxyl group. Hence, option "b" is the correct answer.

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