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Arrange following in correct sequence of basic strength


A.

IV > I > III > II

B.

III > I > II > IV

C.

II > I > III > IV

D.

I > III > II > IV

Solution

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More free the electron present on N atom as a lone pair, more will be its basic strength. In IV lone pair of nitrogen is involved in acromatic `6pi` electrons, hence IV is least basic among all.