Explain why secondary amines are more basic than primary amines.

Explanation

Basic character of amines is due to the presence of lone pair of electrons on N-atom. More the availability of this lone pair, more is the basic character.

Alkyl group `(R-)` is an electron donating group more the number of alkyl groups bonded to N-atom, more is hte availability of electron pair on N-atom and hence more the basic character. Therefore `2^(@)` aliphatic amines are more basic than `1^(@)` aliphatic amines.