The correct answer is C: Chlorofluorocarbons.
Explanation:
Chlorofluorocarbons (CFCs) are a group of chemical compounds that contain carbon, chlorine, and fluorine atoms. They were commonly used in various industrial and consumer applications such as refrigeration, air conditioning, aerosol propellants, and foam-blowing agents. However, their usage has significantly declined due to their harmful effects on the environment.
Here is a detailed explanation of the options:
A: Hydro fluorocarbons
- Hydro fluorocarbons (HFCs) are a different type of chemical compound that replaced CFCs in many applications due to their lower ozone depletion potential.
- HFCs do not contain chlorine atoms, which are responsible for the ozone layer depletion.
B: Ultra fluorocarbons
- There is no such term as "Ultra fluorocarbons" in the context of chemical compounds.
- It is not a recognized term in the field of environmental science.
C: Chlorofluorocarbons
- Chlorofluorocarbons (CFCs) are a group of chemical compounds containing carbon, chlorine, and fluorine atoms.
- CFCs were widely used in the past but have been phased out due to their contribution to ozone depletion.
D: Photo fluorocarbons
- There is no such term as "Photo fluorocarbons" in the context of chemical compounds.
- It is not a recognized term in the field of environmental science.
In conclusion, CFCs stand for Chlorofluorocarbons, which are chemical compounds containing carbon, chlorine, and fluorine atoms. They have been phased out due to their harmful effects on the ozone layer.