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JEE Main levelOne or more correct optionsDifficulty 2 of 3o2141

Which statements about the sulfonation of benzene with fuming sulfuric acid are correct?

Athe electrophile is $SO X_{3}$ (or its protonated form)
Bthe product is benzenesulfonic acid
Cthe reaction is reversible
Danhydrous $AlCl X_{3}$ is required as catalyst

Answer: A, B, C

Sulfonation uses oleum, in which

SO X_{3}

is the electrophile, to give

C X_{6} H X_{5} SO X_{3} H

. Heating with dilute acid reverses it. No Lewis acid is needed, so the

AlCl X_{3}

statement is wrong.

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