The most stable canonical structure among the | vedclass

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(C) In structure $III$,the oxygen atom has a positive charge but it has a complete octet because it forms three bonds (two single and one double bond)

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$III$

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(C) In structure $III$,the oxygen atom has a positive charge but it has a complete octet because it forms three bonds (two single and one double bond) and has one lone pair. In structures $I$ and $II$,the carbon atom with the positive charge has an incomplete octet (only $6$ electrons). Since structure $III$ has a complete octet for all atoms,it is the most stable canonical structure.

The most stable canonical structure among the given structures is:

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