(b) (i) Why do you classify mesomeric effect (M- effect ) into .^(+)M and .^(-)M effect ?

(b) (i) Why do you classify mesomeric effect (M- effect ) into .^(+)M

1.	(b) (i) Why do you classify mesomeric effect (M- effect ) into .^(+)M and .^(-)M effect ?
Answer» SOLUTION :(B) (i) Similar to the other electron displacement EFFECT, mesomeric effect is ALSO classied into positive mesomeric effect `(+M or + R)` and negative mesomeric effect `(-M of -R)` based on the NATURE of the function group present adjective to the multiple bond.