Name the chemicals which are used in refrigerators and air conditioners and damage ozone layer when released in air.

The chemicals used in refrigerators and air conditioners, which damage the ozone layer when released in the air, are called CFCs or Chlorofluorocarbons.

CFCs are made up of chlorine, fluorine and carbon elements. When ultraviolet light waves (UV) strike CFC molecules in the atmosphere, the carbon-chlorine bond breaks and a chlorine atom is produced. The chlorine atom then reacts with an ozone (O₃) molecule and breaks and damages the ozone layer.