Which of these is o, p-directing and deactivating group? - Vidyadip

MCQ

Which of these is $o, p-$directing and deactivating group?

A
$−F$
B
$−Cl$
C
$−Br$
✓
All of these

✓

Answer

Correct option: D.

All of these

$X− ($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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