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
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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 Secondly, when the
alkyl group is small, like –CH3 group, there is no steric hindrance to
H-bonding