Question

Arrange the following compounds in decreasing order of basicity.

• A. $A>C>B>D$
• B. $D>C>B>A$
• C. .$D>C>A>B$
• D. .$A>C>D>B$

Answer 1

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.