Freons - Halogen Derivatives

The chloro fluoro that is 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).

The above derivatives are colourless, non-inflammable, low boiling liquids, non-toxic. These are constant upto 550°C. The very significant and helpful derivative is   which is commonly termed as freon and freon-12.