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(C) The basicity of amines is inversely proportional to their $pK_{b}$ values. Stronger bases have lower $pK_{b}$ values,while weaker bases have highe

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$d > c > b > a$

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(C) The basicity of amines is inversely proportional to their $pK_{b}$ values. Stronger bases have lower $pK_{b}$ values,while weaker bases have higher $pK_{b}$ values.$1$. Comparing aliphatic amines: In aqueous solution,the basicity order of methyl-substituted amines is secondary $(CH_{3}NHCH_{3})$ > primary $(CH_{3}NH_{2})$ > tertiary $((CH_{3})_{3}N)$. Thus,$(CH_{3})_{3}N$ is a weaker base than $CH_{3}NH_{2}$,meaning $(CH_{3})_{3}N$ has a higher $pK_{b}$ value than $CH_{3}NH_{2}$.$2$. Comparing with benzylamines: Benzylamines ($C_{6}H_{5}CH_{2}NH_{2}$ and $C_{6}H_{5}CH_{2}NHCH_{3}$) are significantly less basic than aliphatic amines due to the electron-withdrawing $-I$ effect of the phenyl group.$3$. Comparing benzylamines: $C_{6}H_{5}CH_{2}NHCH_{3}$ (secondary) is more basic than $C_{6}H_{5}CH_{2}NH_{2}$ (primary) due to the $+I$ effect of the additional methyl group,despite the steric hindrance.Basicity order: $CH_{3}NH_{2} > (CH_{3})_{3}N > C_{6}H_{5}CH_{2}NHCH_{3} > C_{6}H_{5}CH_{2}NH_{2}$.Decreasing order of $pK_{b}$ values (inverse of basicity): $C_{6}H_{5}CH_{2}NH_{2} (d) > C_{6}H_{5}CH_{2}NHCH_{3} (c) > (CH_{3})_{3}N (b) > CH_{3}NH_{2} (a)$.Thus,the correct order is $d > c > b > a$.

Arrange the following in decreasing order of their $pK_{b}$ values:

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