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Which one of the following has the shortest carbon-carbon bond length?

1. Benzene
2. Ethene
3. Ethyne
4. Ethane

Correct answer: Ethyne

Solution

The bond length decreases as the bond order increases. Ethyne has a triple bond between carbon atoms, which is shorter than the double bond in ethene, the single bond in ethane, or the delocalized bonds in benzene.

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