Among these canonical structures, which one is least stable?

I

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I I

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I I I

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I V

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Solution

The correct option is D $I V$
Here, due to $- I$ and $- R$ effect of $- C H = O$ group, positive charge on second carbon is highly unstable.
Thus, the compound in option $I V$ is least stable.

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Which of the following is most stable, and which one is least ?
$H C H O$ $C H_{3} C H O$
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III IV

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