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  4. During nitration of benzene using a mixture of conc. HNO3 and conc. H2SO4, function of conc. H2SO4 is to increase the rate of reaction by increasing the concentration of NO2 according to following reaction. HNO3 + H2SO4 arrow NO2 + HSO4 + H2O Here nitric acid acts as

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Q. During nitration of benzene using a mixture of conc. $HNO_3$ and conc. $H_2SO_4$, function of conc. $H_2SO_4$ is to increase the rate of reaction by increasing the concentration of $NO_2$ according to following reaction.
$HNO_3 + H_2SO_4 \rightarrow NO_2 + HSO_4 + H_2O$
Here nitric acid acts as

Hydrocarbons

Solution:

Correct answer is (c) a base

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