The order of basic strength of the following in aqueous solution isNH3, C2H5NH2, (C2H5)2NH, (C2H5)3N

NH 3 > H 2 NC 2 H 5 > N(C 2 H 5 ) 3 > HN(C 2 H 5 ) 2

NH 3 > H 2 NC 2 H 5 > N(C 2 H 5 ) 3 > HN(C 2 H 5 ) 2

(C 2 H 5 ) 3 N > C 2 H 5 NH 2 > (C 2 H 5 ) 2 NH > NH 3

NH 3 > H 2 NC 2 H 5 > N(C 2 H 5 ) 3 > HN(C 2 H 5 ) 2

(C 2 H 5 ) 3 N > (C 2 H 5 ) 2 NH > C 2 H 5 NH 2 > NH 3

(C 2 H 5 ) 2 NH > (C 2 H 5 ) 3 N > C 2 H 5 NH 2 > NH 3

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The order of basic strength of the following in aqueous solution is
NH₃, C₂H₅NH₂, (C₂H₅)₂NH, (C₂H₅)₃N

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(C₂H₅)₃N > C₂H₅NH₂> (C₂H₅)₂NH > NH₃

NH₃ > H₂NC₂H₅ > N(C₂H₅)₃ > HN(C₂H₅)₂

(C₂H₅)₃N > (C₂H₅)₂NH > C₂H₅NH₂ > NH₃

(C₂H₅)₂NH > (C₂H₅)₃N > C₂H₅NH₂ > NH₃

answer is B.

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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 will be steric hindrance.
Therefore, the change of the nature of alkyl group, i.e. from -CH₃ to -C₂H₅ results in change in the order of basic strength.
Thus, there is a subtle interplay of inductive effect, solvation effect and steric hindrance of alkyl group, which decides the basic strength of alkyl amines.

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