Consider the nitratio of benzene using mixed conc. `H_(2)SO_(4)` and `HNO_(3)`. If a large amount of `KHSO_(4)` is added to the mixture, the rate of nitration will be `:`

Options

A. doubled
B. faster
C. slower
D. unchanged

Answer

C

Explanation

For nitronium with mixed acid the active nitrating agent is the nitronium cation `NO_(2)^(+)` which is formed as follows
The overall equation may thus be written as
If a large amount of `KHSO_(4)` is added to the mixture the equilibrium will shift (see the overall equ) toward left there by decreasing the conc of nitronium cation This will slow down the rate of nitration
.