Question

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

• A. Benzene
• B. Ethene
• C. Ethyne
• D. Ethane

Answer 1

Answer: (C)

Ethyne (acetylene) have shortest C-C bond length because it have $C\equiv C$ bond. The bond length follows the following order
$C\equiv C<C=C<C-C$