Question

Is `H_2N` the amino functional group?

Answer 1

Yes

Explanation:

This group would be called the amine or the amino group. This group is obtained by replacing one hydrogen atom of the ammonia molecule `(NH_3)` by an aryl group or an alkyl.

Answer 2

If that nitrogen atom is connected to a carbon atom, yes, it'd be the amine functional group.

For instance, this is a primary amine,