Which of the following are classified as CFC refrigerants?

The classification of CFC (Chlorofluorocarbon) refrigerants is essential to understand due to their environmental impact and regulation under the Montreal Protocol. The correct answer includes R-11, R-12, R-113, R-114, and R-115, all of which are indeed CFCs.

CFCs are known for their ozone-depleting properties, which led to their phase-out in many applications. R-11 and R-12 were widely used in refrigeration and air-conditioning. R-113 is often found in applications like solvent use, while R-114 and R-115 have various uses in the refrigeration sector. The chemical structures of these refrigerants contain chlorine, which contributes to ozone depletion when released into the atmosphere.

The other options contain refrigerants that do not fall under the CFC classification. For instance, R-134a is a HFC (Hydrofluorocarbon), which does not deplete the ozone layer but is a potent greenhouse gas. R-22, R-410A, and R-407C are classified as HCFCs and HFCs, indicating that they have different effects on the environment compared to CFCs. Similarly, R-500