Which of the following statements is not correct?

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All electrophilic substitution reactions except sulphonation involving benzene are irreversible.

The rates of sulphonation reactions involving benzene and deuterated benzene are slightly different

Iodine solution in benzene is brown due to the formation of charge-transfer complex between iodine and benzene.

The reaction of benzene with n-propyl chloride in the presence of ${AlCl}_{3}$ gives 1-phenylpropane as the only product.

answer is D.

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Detailed Solution

(b) In sulphonation reaction, both steps involving the formation of arenium cation and its conversion to the substituted benzene determine the overall rate of reaction. In the second step, the loss of $D^{+}$ from the deuterated <J complex is a little slower than the loss of $H^{+}$ from the ordinary <J complex.

(d) The product cantains both ${PhCH}_{2} {CH}_{2} {CH}_{3} and PhCH {({CH}_{3})}_{2} .$