Step 1: Understanding the Question:
The question asks to identify the option that correctly represents the relationship between the class of hydrocarbon and the type of covalent bond between its carbon atoms.
Step 2: Key Formula or Approach:
Review the basic definitions of saturated and unsaturated hydrocarbons based on their carbon-carbon bonding structures.
Step 3: Detailed Explanation:
• Let us evaluate each class of hydrocarbons:
- Alkanes: Saturated hydrocarbons having only single covalent bonds between carbon atoms (C--C). The general formula is \(\text{C}_n\text{H}_{2n+2}\).
- Alkenes: Unsaturated hydrocarbons containing at least one carbon-carbon double bond (\(\text{C}=\text{C}\)). The general formula is \(\text{C}_n\text{H}_{2n}\).
- Alkynes: Unsaturated hydrocarbons containing at least one carbon-carbon triple bond (\(\text{C}\equiv\text{C}\)). The general formula is \(\text{C}_n\text{H}_{2n-2}\).
• Matching these definitions with the choices, Option (D) correctly identifies that alkynes are characterized by triple bonds.
Step 4: Final Answer:
The correct match is Alkyne - Triple bond.