Give reasons for the following: (i) (CH_(3))_(3)NH is more basic than (CH_(3))_(3)N (ii) Primary amines have higher boiling points than tertiaryamies.

Give reasons for the following: (i) (CH_(3))_(3)NH is more basic than

1.	Give reasons for the following: (i) (CH_(3))_(3)NH is more basic than (CH_(3))_(3)N (ii) Primary amines have higher boiling points than tertiaryamies.
Answer» Solution :The basicity of `(CH_(3))_(2)NH and (CH_(3))_(3)N` mainly depends upon the stability of the AMMONIUM CATION formed when each one of them accepts a PROTON. Since the ammonium cation derived from `(CH_(3))_(2)NH` is stabilized by H-bonding with only one H-atom, therefore, `(CH_(3))_(2)NH` is more basic than `(CH_(3))_(3)N`. (ii) The boiling points of amines depnds upon the degree of association due to H-bonding which, in turn, depends upon the number of H-atoms on the N-atom. since `1^(@)` amines have two H-atoms linked to N-atom while `3^(@)` amines have no H-atom linked to N-atom, therefore, `1^@` amines EXIST as associated Molecules (as shown above) while `3^(@)` amines exist as individual molecules. to break these H-bonds, large amount of nergy is needed. therefore, `1^(@)` amines have higher boiling point than `3^(@)` amines.