Arrange in decreasing order of basic strength :

I > I I > I I I > I V

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I I > I I I > I > I V

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I V > I > I I I > I I

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I V > I > I I > I I I

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Solution

The correct option is C $I V > I > I I I > I I$
Aniline itself act as lewis base as the nitrogen of $- N H_{2}$ can donate electron pairs. Its basic strength increases by presence of $a l k y l$ group which shows $+ I$ effect. Addition of $- C N o r - N O_{2}$ decrease its basic strength as they both show $- M$ effect. $- M$ effect of nitro group is higher than nitrile group. Therfore the order of strength is $I V > I > I I I > I I$

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