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Q.

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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a

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

b

decrease in bond length when terminal double bonds exist

c

sp2 -sp2 overlapping

d

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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