Which of the following amines has the lowest | vedclass

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Question

(A) The $pK_{b}$ value is inversely proportional to the basic strength of the amine. $A$ lower $pK_{b}$ value indicates a stronger base.$1$. $C_6H_5NH

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$C_2H_5NH_2$

Vedclass · Answer

(A) The $pK_{b}$ value is inversely proportional to the basic strength of the amine. $A$ lower $pK_{b}$ value indicates a stronger base.$1$. $C_6H_5NH_2$ (Aniline) is a weak base due to the resonance of the lone pair on nitrogen with the benzene ring.$2$. $(CH_3)_3N$ is a tertiary amine,which is less basic than secondary amines due to steric hindrance.$3$. $C_6H_5CH_2NH_2$ (Benzylamine) is more basic than aniline because the lone pair is not in conjugation with the benzene ring.$4$. $C_2H_5NH_2$ (Ethylamine) is a primary aliphatic amine. In the gas phase,basicity increases with the number of alkyl groups,but in aqueous solution,$C_2H_5NH_2$ is a strong base due to the inductive effect and solvation.Comparing these,$C_2H_5NH_2$ is the strongest base among the given options,hence it has the lowest $pK_{b}$ value.

Which of the following amines has the lowest $pK_{b}$ value?

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