In 1,3-butadiene, the bond length between C2 and C3 is shorter than usual C−C bond due to .

Resonance

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Odd electrons

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Extented Octet

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Solution

The correct option is A 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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C_{2} - C_{3}

C - C

C = C (2) - C (3) = C

C_{2} - C_{3}

C - C

C = C (2) - C (3) = C

1, 3

1, 3 - b u t a d i e n e

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