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Resonance Effect

Which of the ...

Question

Which of the following is the correct order for the stability of the following resonating structures?

A

I > I I > I I I > I V

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B

I > I I = I V > I I I

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C

I > I I > I V > I I I

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D

I > I V > I I > I I I

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Solution

The correct option is B $I > I I = I V > I I I$
Structure $I$ has the maximum number of covalent bonds. Hence it is the most stable structure.

Structure $I I$ and $I V$ both are the same and has the minimum charge seperation of the opposite charges. Hence structrure $I I$ and $I V$ are more stable than structure $I I I$ .

Hence the correct order for the stability of the resonating structures is:
$I > I I = I V > I I I$

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Resonance Effect

Standard XII Chemistry

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