question_answer

Which one of the following is most reactive towards electrophilic attack? [AIPMT (S) 2008]

A)

B)

C)

D)

Correct Answer: C

Solution :

[c] Key Idea: Electron releasing groups stabilise the intermediate cation   whereas    electron Withdrawing groups destabilise it.

The order of electron withdrawing group is:

Hence, is most reactive towards electrophilic substitution because—OH group least destabilise the carbocation. Further —OH group is strongly activating group while — and —Cl are deactivating group.