Which of the following choice is the correct order of resonance energy of these molecules ?

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 A $I > I I > I I I$
(i) No of $π$ bonds $\propto$ resonance energy $\propto$ stability

(ii) contributing structures should be that negative charges reside on an electronegative element, and positive energy resides on an electropositive element.

(iii) In contributing structures,like charges should not reside on atoms close to each other and unlike charges should be widely separated.

So, $I > I I > I I I$ is the answer.

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