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All carbon-carbon bond length is same in molecule

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Butene-1

Benzene

Butene-2

Propyne-1

answer is B.

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Detailed Solution

Butene-1 ${CH}_{2} = CH - {CH}_{2} - {CH}_{3}$ has 2 single and 1 double bond.

Butene-2 ${CH}_{3} - CH = CH - {CH}_{3}$ has 2 single and 1 double bond.

Benzene Question Image has all 6 partial double bonds due to resonance.

Propyne-1 $CH \equiv C - {CH}_{3}$ has 1 single and 1 triple bond.

Bond length depends on bond order, if all bond orders are same -> then bond length is equal.

In benzene, all bonds are equalized due to resonance and thus B.O. is same and so B.L. of all C,C bonds is also same.

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