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Nitrobenzene on reaction with conc. $HNO_3/H_2SO_4$ at 80–100$^\circ C$ forms which one of the following products?
A
1,2,4-Trinitrobenzene
B
1,2-Dinitrobenzene
C
1,3-Dinitrobenzene
D
1,4-Dinitrobenzene
Detailed Solution
The mixture of conc. $HNO_3$ and conc. $H_2SO_4$ gives $NO_2^+$, which acts as the electrophile.
In nitrobenzene the $-NO_2$ group is meta-directing, so $NO_2^+$ attacks the meta position, giving 1,3-dinitrobenzene.