Which of the following refrigerants is chlorine-free?

HFC134A is a chlorine-free refrigerant, which means it does not contain chlorine in its molecular structure. This absence of chlorine is significant because chlorine-based refrigerants, such as CFCs (Chlorofluorocarbons) and HCFCs (Hydrochlorofluorocarbons), have been shown to contribute to ozone depletion when released into the atmosphere. HFC134A, on the other hand, was developed as a more environmentally friendly alternative, particularly in response to the global need to reduce substances that harm the ozone layer.

The other refrigerants listed contain chlorine as part of their molecular structure. CFC12 and HCFC22, for example, contain chlorine which poses significant environmental concerns, particularly with respect to ozone layer depletion. HCFC124 also contains chlorine and, while it is less harmful than CFCs, it still contributes to ozone depletion risks. This makes HFC134A a safer and more environmentally friendly choice in modern refrigeration and air conditioning applications.