MCQ
Consider the nitration of benzene using mixed conc. $H_2SO_4$ and $HNO_3. $ If a large amount of $KHSO_4$ is added to the mixture, the rate of nitration will be
  • A
    unchanged
  • B
    doubled
  • C
    faster
  • slower.

Answer

Correct option: D.
slower.
d
$\mathrm{H}_{2} \mathrm{SO}_{4}+\stackrel{\oplus}{\mathrm{H}} \longrightarrow \mathrm{NO}_{2}+\mathrm{H \stackrel{\ominus}{S}O}_{4}+\mathrm{H}_{2} \mathrm{O}$

$\mathrm{KHSO}_{4} \longrightarrow \mathrm{K}^{\oplus}+\mathrm{H\stackrel{\ominus}{S}O}_{4}$

Due to common ion effect backward reaction will take so the formation $\mathrm{NO}_{2}^{+}$ decrease so nitration process will become slower.

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