Group attached to Benzene ring		Electronic effect exhibited
A)	-O−	I)	+I, +R
B)	–CN	II)	–I, +M
C)	-OCH3	III)	–I, -M
D)	–CH3	IV)	+I, +M

Correct match is

	I	II	III	IV
1.	C	D	B	A
2.	D	C	B	A
3.	C	A	D	B
4.	D	B	C	A

Groups in which the atom directly attached benzene ring have negative charge or lone pair show +M effect. 
Groups in which the atom directly attached benzene ring has multiple bond show –M effect and also –I effect.
-CH₃ group shows +I and +R (hyper conjugation) effects.