cl ia deactivating group then it should be meta directing bt why it s ortho ,para directing group.plz reply quickly

it is an exception in case of halogens , they r electron withdrawing group and hence so - R effect due which they r ortho & para directing & not meta directing

That is because, the +R effect of Chlorine (due to presence of lone pair of electrons) is the dominating effect rather than the -I effect it has due to electronegativity.

Hope you understand the difference between +R and -I.

That should do, similarly you need to remember, what is the dominating effect for other halogens as well. For Fluorine, it is the -I effect that dominates, and hence it is meta directing.

in case of halogens inductive effect is more dominating than mesomeric effect