Final answer:
Most supermarkets have switched from chlorofluorocarbons (CFCs) to hydrofluorocarbons (HFCs), which are more ozone friendly. HFCs, such as CH₂FCF3 (HFC-134a), do not contain chlorine or bromine atoms that can break down ozone molecules.
Step-by-step explanation:
When considering a fire in a supermarket, most supermarkets have abandoned the use of chlorofluorocarbons (CFCs) and are switching to Hydrofluorocarbons (HFCs) which are more ozone friendly.
CFCs are synthetic chemical compounds that have been widely used as refrigerants, propellants, and solvents. However, they contribute to ozone depletion in the upper atmosphere. In order to protect the ozone layer, the Montreal Protocol has phased out the use of CFCs and they are being replaced with HFCs.
HFCs, such as CH₂FCF3 (HFC-134a), do not contain chlorine or bromine atoms that can break down ozone molecules, making them safer for the environment.