Answer:
The most stable resonance structure shown in fig (II).
Explanation:
Given that,
If oxygen is the central atom in the CON– ion
We know that,
Resonance :
The movement of electron is called resonance.
If the electronegativity is more of element then the element is more stable.
We need to find the most stable resonance structure
According to figure,
Electronegativity of N is more than C
So, N is the more stable in fig (II).
Hence, The most stable resonance structure shown in fig (II).