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Question

What is the decreasing order of relative basic strengths of following species?

II > IV > I > III

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III > I > IV > II

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III > IV > I > II

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II > I > IV > III

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Solution

The correct option is D II > I > IV > III
The relative basic strength depend on, the electron donating nature comparison of the species.
Therefore as we all know that $- N H_{2}$ is an EDG so, it would increase basicity but $- C l, - N O_{2} (- N O_{2} > - C l)$ in electronic withdrawing nature would decrease basicity significantly.

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