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Question

Arrange the following compounds in decreasing order of basicity.


A
A>C>B>D
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B
D>C>B>A
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C
.D>C>A>B
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D
.A>C>D>B
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Solution

The correct option is D .A>C>D>B
A) Negative charge on N atom is localised thus is more available for donation and hence more basic than the B, C, D.
C) Negative charge on N atom is localised but due to EWG nature of C=O group it is less available for donation and hence is less basic than the A and more basic than B, D.
B) Among B & D, B is less basic due to easy resonance as compared to D which is stable system.

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