Relative stabilities of the following structures of $C H_{2} = C H - C H O$ are in this decreasing order:

II > I > III

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I > II > III

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III > II > I

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I > III > II

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Solution

The correct option is B I > II > III
The decreasing order for the relative stabilities is $I > I I > I I I$

In structure I, no charge separation is present. Hence, it is most stable.

In II, negative charge is on more electronegative O atom.

Hence, it is more stable than III, in which negative charge is on C atom.

Option B is correct.

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