Consider the nitration of bezene using mixed conc of H_{2}SO_{4} and HNO_{3}. If a large amount of KHSO_{4} is added to the mixture, tne rate of nitration will be

  • Option 1)

    faster

  • Option 2)

    slower

  • Option 3)

    unchanged

  • Option 4)

    doubled

 

Answers (1)

 

Effect of concentration change on equilibrium -

When the concentration of any of the reactants or products in a reaction at equilibrium is changed, the composition of the equilibrium mixture changes so as to minimize the effect of concentration change. If we add reactant, the equilibrium shift towards right.

-

 

In the nitration of benzene in the presence of conc. H2SO4 and HNO3, benzene is formed.

HNO_{3} +H_{2}SO_{4} \leftrightharpoons NO_{2}^{+} +HSO_{4}^{-}+H_{2}O

If a large amount of KHSO_{4} is added to this mixture more HSO4ion furnishes and hence the concentrate of electrophile decreases, rate of electrophile aromatic reaction slows down.


Option 1)

faster

incorrect

Option 2)

slower

correct

Option 3)

unchanged

incorrect

Option 4)

doubled

incorrect

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