In the following molecule, the $C_{2} - C_{3}$ bond length is shorter than the usual $C - C$ bond length. The reason for this observation is ______
$C = C (2) - C (3) = C$

Odd electrons

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Incomplete octet

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Resonance

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Extented Octet

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Solution

The correct option is C Resonance
The given molecule has a resonance structure because of the alternate double bonds.

Thus there is some double bond character present in $C_{2} - C_{3}$ , which makes it shorter.

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