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Which of the following is the correct en...

Which of the following is the correct enthalpy diagramfor the electrophilic aromatic substitution?

A

B

C

D

Text Solution

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The correct Answer is:
4
It is a two step mexhanism the first step formation of the intermediate arenium cation, is usually slow and rate-controlling. The second step, eliminationof `H^(+)`, is fast because it restores aromatiicity, it has no effect on the overall reaction rate.
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