TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Substituents: The substituents are independently halogens, halogenated alkyl groups, halogenated oxa-alkyl groups, aryl ether groups, carbonyl-attached groups, sulfonyl-attached groups, and phosphonyl-attached groups. Preferably, the benzene substituents are independently fluoro, perfluoroalkyl groups, fluorocarbonyl, fluorosulfonyl, and difluorophosphonyl, more preferably the substituents are fluoro, perfluoroalkyl and fluorosulfonyl (-SO2F).Preferred Conditions: The reaction is carried out in the presence of a free radical generator or added I2.Preferred Generator: The free radical generator is UV light, tri-iron dodecacarbonyl and peroxides.Preferred Process: The process additionally comprising step of removing X,X from (CFX2CFX)n-Ar by contacting it with zinc metal to form (CFX=CF)n-Ar. The first reactant is CF2XCFXI, CF2ClCFClI or CF2ClCF2I or CF3CFClI or CFCl2CF2I or a mixture of CF2ClCFClI and CFCl2CF2I. The process also comprising a step of sulfonating (CFX2CFX)n-Ar to form (CFX2CFX)n-Ar-(SO3H) or a sulfonyl fluoride of the formula (CFX2CFX)n-Ar-(SO2F)m.m = 1 or 2, preferably 1.The process further comprising a step of polymerizing or copolymerizing (CF2=CF)n-Ar or (CF2=CF)n-C6H4-(SO3H) to form a (co)polymer that includes units of formula -(CF2-CF(Ar))- or -(CF2-CF(C6H4-SO3H))- respectively. Preferred Definitions:    n = 1 or 2, preferably 1;    Ar = benzene, monosubstituted benzene, disubstituted benzene and polysubstituted benzene bearing 3-5 substituents, preferably benzene.    EXAMPLE - A mixture of 139.4 g dichlorotrifluoroiodoethane, C2Cl2F3I, and 58.6 g benzene was sealed in a 220 ml stainless steel autoclave equipped with a nickel rupture disk and a jacket heater. The dichlorotrifluorojodoethane,C2Cl2F3I,comprised a mixture of    62% CF2CICFClI and 3 8% CF2ICFCl2, prepared as described in Example 6 of U. S. Patent No. 3,002,030 with the exception that the gasseous C2FCI3 reactant was passed into a closed, stirred Hastelloy reaction vessel containing the ICI. The mixture was rocked and heated at 200 degreesC for 17.5 hours, and the resulting liquid product was decanted from iodine crystals and determined to contain about 35 g of a mixture of 23 wt.% 1-phenyl-2,2-dichloro- 1, 1,2-trifluoroethane (the alternate product) and 33 wt.% 1 -phenyl- 1,2-dichloro- 1,2,2-trifluoroethane (the preferred product).