Among the following compounds nitrobenzene, benzene, aniline and phenol, the strongest basic behaviuor in acidic medium is exhibited by:

Phenol

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Aniline

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Nitrobenzene

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Benzene

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Solution

The correct option is B Aniline
Because the N atom in aniline has a lone pair to donate and also due to +I effect of $- N H_{2}$ group, the electron density also increases. The lone pair of aniline also take part in resonance making the structure more stable. In phenol and nitrobenzene, there are electron withdrawing groups are present, hence electron density will decrease. Therefore, most basic will be aniline.

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