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

• (A) Faster
• (B) Slower
• (C) Unchanged
• (D) Doubled

The nitration of benzene involves the generation of the nitronium ion (NO₂⁺) from a mixture of concentrated nitric acid (HNO₃) and sulfuric acid (H₂SO₄). When potassium hydrogen sulfate (KHSO₄) is added to this mixture, it can influence the reaction rate.

Effect of KHSO₄ on Nitration

KHSO₄ can act as a catalyst in this reaction. It helps in the formation of the nitronium ion, which is crucial for the nitration process. By increasing the concentration of the nitronium ion, the presence of KHSO₄ can enhance the overall reaction rate.

Conclusion on Reaction Rate

Therefore, when a large amount of KHSO₄ is added to the nitration mixture, the rate of nitration will be:

• Faster (Option A)