What is a common product of combustion reactions?

In combustion reactions, a substance typically reacts with oxygen to produce energy in the form of heat and light, along with various products. When hydrocarbons, which are organic compounds made up of hydrogen and carbon, undergo complete combustion, the primary products generated are carbon dioxide and water. Carbon dioxide is a common product because it signifies the complete oxidation of carbon present in the fuel, and it is typically released into the atmosphere after combustion.

While carbon monoxide can also be produced, it occurs primarily during incomplete combustion when there is insufficient oxygen. In contrast, hydrogen is not a typical product of combustion reactions involving hydrocarbons, as it is usually a reactant rather than a product. Consequently, identifying carbon dioxide as a common product aligns with the characteristics of combustion reactions involving hydrocarbons, which is why it is the correct answer.