The greater the size of the ion,
lesser will be the solvation and the less stabilised is the ion The
order of stability of ions are as follows:
Decreasing order of  extent of H-bonding in water and order of
stability of ions by solvation Rationalised 2023-24
269
Amines
Greater is the stability of the substituted ammonium cation, stronger
should be the corresponding amine as a base Thus, the order of basicity
of aliphatic amines should be: primary > secondary > tertiary, which
is opposite to the inductive effect based order