Question

Reagent used for sulphonation is-​

Answer 1

Answer:

Sulfonation is a reversible reaction that produces benzenesulfonic acid by adding sulfur trioxide and fuming sulfuric acid. The reaction is reversed by adding hot aqueous acid to benzenesulfonic acid to produce benzene.

Explanation:

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Answer 2

Answer:

fuming sulphuric acid $(H_{2}SO_{4}+ SO_{3})$ is used as a reagent in sulphonation reaction.

Explanation:

Sulphonation:- Basically Sulfonation is a reaction of benzene with fuming sulphuric acid $(H_{2}SO_{4}+ SO_{3} )$, in this process benzene is heated with fuming sulphuric acid $(H_{2}SO_{4}+ SO_{3} )$that gives benzenesulfonic acid and the nature of this reaction is reversible.

Mechanism:-

As it has a higher electronegativity, the oxygen present in sulphuric acid$(H_{2}SO_{4}+ SO_{3} )$ pulls an electron towards itself, giving it an electrophile. This attack on the benzene ring leads to the formation of benzenesulfonic acid.