Question

Choose the most stable resonating structure out of the given structures :

• A. Structure (a)
• B. Structure (b)
• C. Structure (c)
• D. All are equally stable.

Answer 1

The correct option is A Structure (a)

Negative charge on more electronegative element and positive charge on more electropositive element is stable.
In structure (a), negative charge is on most electronegative element (oxygen), as compared to structure (c) and structure (a), where negative charge is on lesser electronegative elements (nitrogen and carbon respectively).
Order of stability
$\left(a\right)>\left(c\right)>\left(b\right)$