Answer :

Freons are Chlorofluorocarbons which are made up of chlorine, carbon, and fluorine. When carbon tetrachloride reacts with hydrogen fluoride in the presence of SbCl5 then Freon-11 is formed.

CCl4 + HF CCl3F + HCl (in presence of SbCl5)


The system contains a body, CFC, a number, 01234, and an alphanumeric suffix, a: CFC-01234a


● The body stands for the group type


● The number stands for the molecular formula


● The suffix stands for different isomers



Example:


CFC-12b1 has no double bonds, only 1 carbon atom, no hydrogen atoms, 2 fluorine atoms, one chlorine atom replaced by bromine and no isomers = Bromochlorodifluoromethane


If it is a cyclic structure the number is prefixed with a "C" for cyclic. Sometimes some other bodies are found like FC (fluorocarbon), HC (Halocarbon) or R(refrigerant).



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