Which one is the weakest base?

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(A) The basic strength order of the given amines in the aqueous phase is $((CH_3)_2NH) > (CH_3NH_2) > ((CH_3)_3N) > (NH_3)$.Among the given options,am

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Ammonia

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(A) The basic strength order of the given amines in the aqueous phase is $((CH_3)_2NH) > (CH_3NH_2) > ((CH_3)_3N) > (NH_3)$.Among the given options,ammonia $(NH_3)$ is the weakest base.This is because the alkyl group $(CH_3)$ exerts a $+I$ (inductive) effect,which increases the electron density on the nitrogen atom,thereby increasing the basicity of amines compared to ammonia.

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