The haloalkanes used in drycleaning industries are
trichloromethane and tetrachloromethane
chloroethene and dichloroethene
trichloroethene and tetrachloroethene
chloroethane and dichloroethane
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Correct answer: trichloroethene and tetrachloroethene (Option C)
Explanation: The dry-cleaning industry has historically used chlorinated ethenes, especially tetrachloroethene (perchloroethylene, PCE) as the principal solvent, with trichloroethene (TCE) also used (now more restricted). The other pairs are not standard dry-cleaning solvents: chloroethene/dichloroethene are vinyl monomers, chloroethane/dichloroethane are mainly intermediates, and trichloromethane/tetrachloromethane are chlorinated methanes (largely phased out for safety/toxicity.
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