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The correct order of basic strength of the following are

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III > IV > II > I

IV > II > III > I

I > II > III > IV

III > II > IV > I

answer is D.

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Detailed Solution

Amines are more basic

In III lone pair is not in conjugation and lone pair electrons are readily available for protonation and is more basic

In II due to +M effect of OH group lone pair electrons on N is less readily involved in conjugation with C=O group and more readily available for protonation

In I lone pair electrons on N atom is readily involving in resonance with benzene ring and not available for protonation

Basic strength order is III > II > IV > I

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