1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: Rates of nitration of benzene and hexadeuterobenzene are different. Reason: C - H bond is stronger than C - D bond.

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Q. Assertion : Rates of nitration of benzene and hexadeuterobenzene are different.
Reason : $C - H$ bond is stronger than $C - D$ bond.

AIIMSAIIMS 2005Hydrocarbons

Solution:

Rates of nitration of benzene and hexadeuterobenzene are same because the rate determining step is production of electrophile. Besides C-H and C-D bonds in benzene have equal strength. Thus, both assertion and reason are false.