Which of the following best describes an alkyne functional group in a hydrocarbon structure?

• A. A $\mathrm{carbon}-\mathrm{carbon}=$ double bond
• B. A $\mathrm{carbon}-\mathrm{carbon}$ single bond
• C. A $\mathrm{carbon}-\mathrm{carbon}\equiv$ triple bond
• D. A benzene ring

Answer: (C)

Verified step by step guidance

1. Recall that hydrocarbons are organic compounds composed entirely of carbon and hydrogen atoms.
2. Understand that the functional group defines the characteristic bonding pattern and reactivity of a hydrocarbon.
3. Identify the types of carbon-carbon bonds: single bond (alkane), double bond (alkene), and triple bond (alkyne).
4. Recognize that an alkyne is characterized by a carbon-carbon triple bond, which is represented as \(\mathrm{C \equiv C}\).
5. Conclude that among the options, the best description of an alkyne functional group is the carbon-carbon triple bond.