Question

Compare basic strengths of the following compounds :

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

Answer 1

The correct option is C C > A > B

$\text{Basic strength}\propto \frac{1}{\text{Stability of anion}}$

In case of C , there is no delocalisation of negative charge, so it is the least stable species and the most basic.
Between A and B :
In A there is cross conjugation as compared to B where there is extended conjugation (as shown below).
So, B is the more stable species as comapred to C and thus the least basic.