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NEET levelSingle correct optionDifficulty 1 of 3nc147

The electrophile responsible for the nitration of benzene with a mixture of conc. $HNO X_{3}$ and conc. $H X_{2} SO X_{4}$ is

A $NO X_{3} X^{-}$
B $NO X^{+}$
C $NH X_{2} X^{+}$
D $NO X_{2} X^{+}$

Answer: D

Sulfuric acid protonates nitric acid, which loses water to give the nitronium ion:

HNO X_{3} + 2 H X_{2} SO X_{4} NO X_{2} X^{+} + H X_{3} O X^{+} + 2 HSO X_{4} X^{-}

. The nitronium ion is the attacking electrophile.

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