Concept:Dry cleaning uses volatile organic solvents that dissolve grease and oil, and the chlorinated methane haloalkanes serve this purpose.
Explanation:Dry cleaning removes dirt without water by applying an organic solvent to the fabric.
A suitable dry-cleaning solvent must dissolve grease and evaporate readily.
The fabric is treated with the solvent, which lifts oily stains, and then the solvent quickly evaporates.
Trichloromethane (
CHCl3) and tetrachloromethane (
CCl4) are volatile haloalkanes.
Both compounds are good solvents for fats and oils.
Because of this property, they are used as dry-cleaning solvents in industry.
Trichloromethane is also called chloroform, while tetrachloromethane is called carbon tetrachloride.
Therefore, the two haloalkanes used in dry-cleaning industries are the ones listed in option A.
Answer:A. trichloromethane and tetrachloromethane