In the below mentioned compounds the decreasing order of reactivity towards electrophilic substitution is (i)
(ii)
(iii)
(iv)

• A

  (iv) $>$ (i) $>$ (ii) $>$ (iii)
• B

  (ii) $>$ (iii) $>$ (i) $>$ (iv)
• C

  (iii) $>$ (i) $>$ (iv) $>$ (ii)
• Correct answer
  D

  (i) $>$ (ii) $>$ (iii) $>$ (iv)

Solution

$-\mathrm{OCH}_3$ and $-\mathrm{CH}_3$ groups are activating group while $-\mathrm{CF}_3$ is a deactivating group.

Hence, the correct answer is option: 'D'.