Why are amines basic in nature?
Amines are basic in nature because the nitrogen atom in amines possesses a lone pair that can be donated.
According to the Lewis acid-base concept, amines can donate an electron pair, so they are Lewis bases.
Also, Brønsted-Lowry bases can accept a proton to form substituted ammonium ions.
So, amines are bases according to both the Lewis and the Brønsted-Lowry theories.