Question

The correct stability order of the given resonating structures is :

• A. $\left(a\right)>\left(b\right)>\left(c\right)$
• B. $\left(c\right)>\left(b\right)>\left(a\right)$
• C. $\left(a\right)>\left(c\right)>\left(b\right)$
• D. $\left(c\right)>\left(a\right)>\left(b\right)$

Answer 1

The correct option is D $\left(c\right)>\left(a\right)>\left(b\right)$

Structure (a) and (c) have more number of covalent bonds as compared to structure (b), so they are more stable than (b).
Comparing structure (a) and (c) , we see that in structure (c), positive charge is on more electropositive atom (nitrogen) as compared to structure (a), where positive charge is on more electronegative element (oxygen)
So, (c) is the most stable structure followed by (a) and then (b)