Basicity of \(1^\circ\), \(2^\circ\) and \(3^\circ\) amines is decided by the factors which are given as:
(1) +I effect of alkyl group: Due to +I effect of alkyl groups, the basicity order of amines will be
(CH3)3N > (CH3)2NH > CH3NH2
(2) Solvation effect: Due to solvation effect the order of basic strength will be
CH3NH2 > (CH3)2NH > (CH3)3N
(3) Steric factor: More the steric hindrance, less will be the basicity of amine in general. Therefore the order will be
\(1^\circ\)> \(2^\circ\)> \(3^\circ\) amines.
Since two factors favours \(2^\circ\) amines for making it more basic than \(3^\circ\) amine Hence (CH3)2NH will be more basic than (CH3)3N
