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Nitration of Aromatics

Which of the ...

Question

Which of the following intermediate is formed when benzene reacts with $C H_{3} C O C l$ in presence of anhydrous $A l C l_{3}$ ?

A

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B

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C

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D

No intermediate is formed.

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Solution

The correct option is A
Friedel-Crafts Acylation:
One H-atom of the ring gets replaced by Acyl (RCO) group. The attacking electrophile is an acylium ion $(C H_{3} - C \equiv O^{+})$ made available by the reaction of acid halide and an anhydrous lewis acid.
Formation of an arenium ion (intermediate) :

The resonating structures for the intermediate are :

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Nitration of Aromatics

Standard XII Chemistry

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