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Resonance Effect

The four stru...

Question

The four structures:
$H - (C = O) - O H$ $⟷$ $H - (+ C - O^{-}) - O - H$ $⟷$ $H - (- C - O +) - O - H$
Which of the following order is correct for the stability of the four contributing structures.

I > I I > I I I

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I > I I I > I I

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I I I > I > I I

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I I > I > I I I

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Solution

The correct option is C $I > I I > I I I$
$i)$ Unionized structure is more stable than ionized.
$i i)$ $I I I$ structure has positive charge on oxygen as oxygen is more electronegative than carbon, so positive charge on oxygen atom makes it least stable.
$i i i)$ So, correct order is $I > I I > I I I$ .

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