Among the following amines, which one has the highest $p K_{b}$ value in aqueous solution?

Methanamine

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N, N-dimethylaniline

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Ethanamine

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Benzenamine

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None of the above

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Solution

The correct option is D Benzenamine
+Inductive effct increases the electron density on nitrogen thus makes it more basic while +R effect involves the lone pair of N in conjugation thereby reduces its basicity.
Therefore aniline are less basic than alkyl amines and secondary aniline are more basic than aniline.
Highest $p K_{b}$ means least basic nature, therefore option D is correct.

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