Benzene reacts with $H_{2} {SO}_{4}$ only when the acid is

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Hot and dilute

Mixed with ${HNO}_{3}$

Hot and conc.

Cold and dilute

answer is D.

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Detailed Solution

Typically, fuming sulphuric acid is used to sulphonate benzene at room temperature. We must use hot, concentrated $H_{2} {SO}_{4}$ because sulphonation occurs in concentrated $H_{2} {SO}_{4}$ but more slowly.

Therefore, the correct option is (D) Mixed with ${HNO}_{3}$ .

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