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Question

In nitration of benzene using conc. H2SO4 and conc. HNO3, the role of nitric acid is

A
an acid
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B
a base
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C
a reducing agent
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D
an oxidising agent
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Solution

The correct option is B a base
Nitration is electrophilic substitution reaction; in its first step HNO3 takes protons from sulphuric acid and then forms NO+2, so here HNO3 acts as base.
HNO3+H2SO4H2O+NO+2Nitration ion(attacking species)+HSO4
H2SO4 serves as the acid and HNO3 as the base.
Hence, the correct answer is option (b).

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