Question

Benzene reacts with conc. H2SO4 attacking reagent is
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Answer 1

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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.

@MissTranquillity

Answer 2

Nitration of Benzene

Explanation:

Benzene when treated with concentrated nitric acid and sulfuric acid at 330K temperature it forms nitrobenzene that is nitration occurs

The reaction is highly explosive and risky as a lot of heat is evolved during the reaction

The nitration of benzene starts with the activation of  with sulfuric acid that is through the protonation of nitric acid by sulfuric acid.

After the protonation, it produces a strong electrophile, the nitronium ion and loses a water molecule as a by-product

After the formation of nitronium ion it attacks the benzene ring for the formation of the product Nitrobenzene