The structure of 1,3-butadiene is CH2=CH−CH=CH2and the distance between the central carbon atoms is 1.46 A0 (instead of 1.54 A0). This is due to the

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existence of non-octet resonance structures involving double bonding between the central carbon atoms

decrease in bond length when terminal double bonds exist

sp2 -sp2 overlapping

p-p overlapping

answer is A.

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Detailed Solution

Due to resonance, aII structures are equivalent and thus bond lengths are also equal.

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