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Grade: 11
How to easily find which is +m and-m group and what is way
to find it
6 months ago

Answers : (3)

24734 Points
+M effect- groups which have lone pairs (also incld functional groups with lone pairs) , all methyl grps (due to hyperconjugation), groups with a negative charge
-M groups- groups with positive charge, functional groups with no lone pair(eg NO2)
Remember - halogens show +m effect and -I effect but their -i effect is more dominating while in other functional groups +M is more dominating if they show +M and -I ( -OCH3)
6 months ago
Vikas TU
11683 Points
Dear student 
-M Effect is shown by groups which decreases the electron density on benzene.
+M Effect is shown by groups which increases the electron density on benzene ring.
Good Luck 
6 months ago
32 Points
+M Group has lone pair or - ve charge and - M group has +ve charge or conjugate system which has more EN than other conjugate system example is ph-cho, Cho is a - M group bcz it has more EN than C=C bond in benzene 
5 months ago
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