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The decreasing order of bond length of C = C in the following compound is:

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$II > I > IV > III$

$III > II > I > IV$

$IV > II > I > III$

$IV > I > II > III$

answer is B.

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Detailed Solution

C = C bond length is maximum in (III) because of resonance.

resonance also occurs in (I)
Hyperconjugation occurs in (II) and (IV)

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