Q. Which of the following reaction takes place when a mixture of conc. $HNO_3$ and $H_2SO_4$ reacts with benzene at $300\, K$ ?
Amines
Solution:
A mixture of conc. $HNO_3$ and conc. $H_2SO_4$ introduces one $-NO_2$ group at $55^{\circ} C$ and two nitro groups at $100^{\circ}C$.