The correct stability order of the following resonance structures is:

(I) > (II) > (IV) > (III)

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(I) > (III) > (II) > (IV)

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(II) > (I) > (III) > (IV)

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(III) > (I) > (IV) > (II)

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Solution

The correct option is B (I) > (III) > (II) > (IV)
Stability of the canonical structures are decided by following factors.
i) Neutral structures are most stable.
ii) Greater the number of covalent bonds, greater is the stability
iii) Structure with a negative charge on the more electronegative atom will be more stable.
iv) Charge separation: like charges should be at the maximum distance.
Hence, the stability order is: $(I) > (I I I) > (I I) > (I V)$

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