Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

1. Chlorobenzene is more reactive than benzene towards electrophilic substitution.

Explanation:
Chlorine shows two effects −I & +M.
Due to the −I effect of Cl group, it reduces the electron density of benzene so chlorobenzene is less reactive than benzene for electrophilic substitution reaction.
But due to the +M effect, it is ortho, para directing, and in chlorobenzene further substitution takes place at ortho and para positions.