Question

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

• A. $-F$
• B. $-Cl$
• C. $-Br$
• D. All of these

Answer 1

The correct option is 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.