Question

-NH2 group is earthing para directing explain

Answer 1

Explanation:

NH2 group is ortho,para directing.because it undergo +I effect,and it is most activating group.

but NH3+ is meta directing.

Answer 2

Answer:

In NH2 the nitrogen attached to the benzene ring has excess of electron hence it is + R directing group. While in NO2 the nitrogen attached to the benzene ring do not have extra lone pair of electrons hence it is -R effecting group which is meta directing.