Which is the weakest Bronsted base?

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(A) The basicity of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.In $Aniline$ $(C_6H_5NH_2)$,

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Aniline

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(A) The basicity of amines depends on the availability of the lone pair of electrons on the nitrogen atom for protonation.In $Aniline$ $(C_6H_5NH_2)$,the lone pair of electrons on the nitrogen atom is involved in resonance with the benzene ring,which significantly reduces its availability for protonation.In $Piperidine$,$Cyclohexylamine$,and $Methylamine$ $(CH_3NH_2)$,the lone pair is localized on the nitrogen atom and is not involved in resonance,making them much stronger bases than $Aniline$.Therefore,$Aniline$ is the weakest Bronsted base among the given options.

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