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Question

Which of the following is the correct order of the rate of reaction of C6H6,C6D6 and C6T6 towards nitration?

A
C6H6>C6D6>C6T6
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B
C6H6=C6D6=C6T6
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C
C6H6>C6D6=C6T6
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D
C6T6>C6D6>C6H6
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Solution

The correct option is B C6H6=C6D6=C6T6

The rates of nitration of C6H6, C6D6 and C6T6 are the same.
The rate-determining step for nitration through Electrophilic Aromatic Substitution is the attack of the electrophile(NO+2) on the aromatic substrate.

Thus changing the H atoms to its isotopes will not affect the reaction at all. The change of these atoms affects the reaction only when the breakage of these CH/D/T bonds is a part of the rate determining step.


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