See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

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 6 6 6 6 C H C D ,  since no kinetic isotope effect is observed when H is replaced by D. Hence, the order is as given in option (C).