The order of basicity of the compounds

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IV>I>II>II

I>II>II>IV

III>I>IV>II

II>I>III>IV

answer is B.

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Detailed Solution

The order of basicity is I > III > I> IV

The lone pair of electrons on N is more readily available for protonation in I and III then in II. IlI contains an oxygen atom which has — I effect due to which it is less basic than I. In compound IV lone pair of e^-s on N—atom is contributed towards the aromatic sextet formation and hence is not at all available for protonation. Hence option (2) is correct.

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