MCQ
Which of these is o, p-directing and deactivating group?
- A−F
- B−Cl
- C−Br
- DAll of these
✓
Answer
- All of these
Explanation:
X− (halogen group) has two effects −I & +M.
Due to the −I group, it reduces the electron density of benzene so halobenzene is less reactive than benzene for electrophilic substitution reaction.
But due to the +M effect, it is ortho, para directing (resonance effect predominates over inductive effect) and in halobenzene, further substitution takes place at ortho and para positions.
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