Q.

Consider the nitration of benzene using mixture of conc.H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be

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a

Unchanged

b

Doubled

c

Faster

d

Slower

answer is D.

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Detailed Solution

Mechanism of nitration is : HNO3+2H2SO4⟶NO2++2HSO4-+H3O+If a large amount of  KHSO4 is added then conc. of HSO4- ions increases and the reaction will be shifted in backward direction hence, the rate of nitration will be slower.
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Consider the nitration of benzene using mixture of conc.H2SO4 and HNO3. If a large amount of KHSO4 is added to the mixture, the rate of nitration will be