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  4. The order of basicity of the compounds is

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Q. The order of basicity of the compounds
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AIEEEAIEEE 2012Amines

Solution:

The order of basicity is $I > III > II > IV$ The lone pair of electrons on N is more readily available for protonation in I and III then in II. Ill 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 (b) is correct.