The order of basic strength of methyl substit | vedclass

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Question

(A) The basic strength of aliphatic amines in aqueous solution is determined by the combined effect of three factors: $(i)$ Inductive effect: The $+I$

Vedclass · Accepted Answer

$(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$

Vedclass · Answer

(A) The basic strength of aliphatic amines in aqueous solution is determined by the combined effect of three factors: $(i)$ Inductive effect: The $+I$ effect of alkyl groups increases electron density on the nitrogen atom,making tertiary amines potentially more basic. $(ii)$ Solvation effect: Primary amines are stabilized more effectively by hydrogen bonding with water molecules,which favors their basicity. $(iii)$ Steric hindrance: Bulky alkyl groups in tertiary amines hinder the approach of a proton to the nitrogen lone pair,reducing basicity. Considering the interplay of these factors for methyl-substituted amines,the observed order of basicity in aqueous solution is $(CH_3)_2NH > CH_3NH_2 > (CH_3)_3N > NH_3$.

The order of basic strength of methyl substituted amines and $NH_3$ in aqueous solution is

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