Question

Why amines are basic in nature?

Answer 1

The basic nature of amines is due to the presence of a lone pair of electrons on the nitrogen atom.
As per Lewis theory, amines are bases because they can share a lone pair of electrons on an N-atom with electron-deficient species.

\[\ce{\underset{(Trimethyl amine}{(CH3)3{\mathbf{N}^{\bullet}_{\bullet}}} + \underset{(e- deficient)}{BF3} -> (CH3)3\overset{\oplus}{N} \overset{\ominus}{B}F3}\]