Degree of Amines :
Nitrogen atom connected with 1 carbon is known as
1 0 Amine or Primary Amine. In other words Primary amine has -NH
2 group.
Nitrogen atom connected with 2 carbon is known as
2 0 Amine or Secondary Amine. In other words Secondary amine has -NH- group.
Nitrogen atom connected with 3 carbon is known as
3 0 Amine or Tertiary Amine. In other words Tertiary amine has N atom without any Hydrogen atom.