The decreasing order of the rate of nitration of the following compounds is:
I. Benzene
II. C₆D₆
III. Nitrobenzene
IV. Chlorobenzene

Question

The decreasing order of the rate of nitration of the following compounds is: I. Benzene II. C 6 D 6 III. Nitrobenzene IV. Chlorobenzene

TestHub · Accepted Answer

Rate is faster when the substituent activates the ring (+I or/and +R, o/p) and the rate is slower

when the substituent deactivates the ring (– I, R; m). Halogen deactivates the ring (– I, +R, – I >

+R) but the orientation is o/p.

Rate of C₆H₆ ≃ C₆D₆, since no kinetic isotope effect is observed when H is replaced by D.

Hence, the order is as given in option (C).

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