Which type of refrigerant is no longer produced due to its damaging effects on the ozone layer?

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

Answer: (C)

The correct choice highlights CFCs, which stands for chlorofluorocarbons. CFCs are a type of refrigerant that have been found to contribute significantly to the depletion of the ozone layer. The chemicals released into the atmosphere from products containing CFCs break down ozone molecules, leading to thinner ozone in the stratosphere, which protects the Earth from harmful ultraviolet radiation.

In response to the environmental impact of CFCs, the Montreal Protocol was established in 1987, leading to a global effort to phase out their production and use. This protocol initiated a transition to more environmentally friendly alternatives, including HFCs (hydrofluorocarbons) and HCFCs (hydrochlorofluorocarbons), although the latter still has harmful environmental effects that are being addressed in further agreements.

The other substances listed, such as HFCs and HCFCs, while they do have environmental impacts, particularly on global warming potential, are not associated with ozone depletion in the same way that CFCs are. Amines are not refrigerants and do not have a direct relationship with ozone layer damage.

Thus, the answer regarding CFCs is accurate because it acknowledges the specific harm these gases cause to