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

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

Grade:11

3 Answers

Shubham Sharma
29 Points
9 years ago

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

Ashwin Muralidharan IIT Madras
290 Points
9 years ago

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.

suchita undare
20 Points
9 years ago

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

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