Consider the following resonating structures
Which of the following statements is or are correct about these resonating structures?

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Structure I is more stable then structure II

structure IV is more stable and structure III

structure III is more stable then structure IV

structure II is more stable than structure I

answer is A, B.

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Detailed Solution

In structure I carbon atom does not have complete octet whereas in structure II oxygen atom does not have complete octet. The structure II is more unstable as more electronegative oxygen atom holds the positive charge. In structure III carbon atom does not have complete
octet whereas in in structure IV carbon and oxygen atoms have complete octet. Since completion of octet is a more important criterion for stability than the choice of atom holding positive charge; structure IV is most stable than structure III.
Hence, (A) and (B) are correct.

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