Halocarbons include several types of gases. Which is NOT an example of halocarbon?

• A. CFCs
• B. HCFCs
• C. CO2
• D. HFCs

Answer: (C)

Halocarbons are a class of chemicals that contain carbon and halogen atoms, which are often used in refrigeration, air conditioning, and as solvents. The correct response indicates that carbon dioxide (CO2) is not a halocarbon.

CO2 is a simple molecule composed of one carbon atom and two oxygen atoms, containing no halogen elements in its structure. In contrast, chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and hydrofluorocarbons (HFCs) are all halocarbon compounds. They consist of carbon atoms bonded to at least one halogen atom—such as chlorine, fluorine, or bromine—making them part of the halocarbon family.

Understanding the defining features of halocarbons is essential in recognizing the broader implications concerning ozone depletion and global warming, as several halocarbons are potent greenhouse gases or ozone-depleting substances.