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Resonance Effect

The correct o...

Question

The correct order of decreasing length of the bond as indicated by the arrow in the following structures is:

I > II > III

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II > I > III

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III > II > I

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I > III > II

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Solution

The correct option is C III > II > I
The length of carbon-carbon single bond is always greater than that of the carbon-carbon double bond. In III, positive charge is not in conjugation of double bond, so the bond does not acquire a double bond character. However, chances of acquiring double bond character (of the indicated bond) is much more in I than that in case of II. Thus, the correct order of decreasing bond length is:

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