All the carbon-carbon bond lengths are equal in:

1

-butene

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benzene

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2

-butene

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propyne

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Solution

The correct option is B benzene
$C - C$ bonds are equivalent in benzene, due to the phenomenon of resonance, where the $π$ electrons are shared amongst all atoms.

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All the C - O bonds in carbonate ion $(C O_{3}^{2 -})$ are equal in length. Explain

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