Which of the following is a product of complete combustion of a hydrocarbon?

• A. Carbon monoxide
• B. Hydrogen peroxide
• C. Water and carbon dioxide
• D. Methane

Answer: (C)

Complete combustion of a hydrocarbon occurs when there is enough oxygen, turning the fuel into carbon dioxide and water. In full oxidation, all the carbon becomes CO2 and all the hydrogen becomes H2O, releasing energy as heat. The option listing water and carbon dioxide matches these expected products, so it’s the best choice. If oxygen were limited, incomplete combustion could produce carbon monoxide or soot instead. Hydrogen peroxide isn’t formed from hydrocarbon burning, and methane is the fuel, not a product.