Which of the following is the weakest base?

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Question

(B) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom. Alkyl groups are electron-releasing g

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Ammonia

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(B) The basic strength of amines depends on the availability of the lone pair of electrons on the nitrogen atom. Alkyl groups are electron-releasing groups that exert a positive inductive effect $(+I)$,which increases the electron density on the nitrogen atom,thereby increasing the basicity. In $NH_3$ (ammonia),there is no alkyl group attached to the nitrogen atom. Therefore,$NH_3$ is the weakest base among the given options.

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