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Which of the following act as catalysis in the nitration of benzene?

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Which of the following act as catalysis in the nitration of benzene?

(a) Conc. HCl

(b) Dil. HCl

(c) Conc. H2SO4

(d) Dil. H2SO4

The question was posed to me during a job interview.

I need to ask this question from Electrophillic Substitution Reaction in section Reactivity of Molecules Reaction Mechanism of Engineering Chemistry I

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Correct choice is (c) Conc. H2SO4

Easy explanation: Conc. H2SO4 act as a catalysis in the nitration of benzene. Benzene is treated with a mixture of concentrated nitric acid and concentrated sulphuric acid at a temperature not exceeding 50°C.

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