Freons : The chloro fluoro derivatives of  methane and ethane are called freons. Some of the derivatives are: CHF₂Cl (monochlorodifluoromethane), CF₂Cl₂ (dichlorodifluoro-methane), HCF₂CHCl₂ (1,1-dichloro-2,2-difluoroethane). These derivatives are colourless, non-inflammable, low boiling liquids, non-toxic. These are constant upto 550°C. The very important and useful derivative is CF₂Cl₂ which is commonly known as freon and freon-12.

         Freon  or freon-12 (CF₂Cl₂) is prepared by treating carbon tetrachloride with antimony trifluoride in the presence of antimony pentachloride as a catalyst.

         Or it can be generated by reacting carbon tetrachloride with hydrofluoric acid in presence of antimony pentafluoride.

         Under ordinary conditions freon is a gas. Its boiling point is -29.8°C. It can easily be liquified. It is chemically inert. It is needed in air-conditioning and in domestic refrigerators for cooling purposes (As refrigerant). It produces depletion of ozone layer.

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