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Uses of Freon − 12
Freon-12 (dichlorodifluoromethane, CF2Cl2) iscommonly known as CFC. It is used as a refrigerant in refrigerators and airconditioners. It is also used in aerosol spray propellants such as body sprays,hair sprays, etc. However, it damages the ozone layer. Hence, its manufacturewas banned in the United States and many other countries in 1994.
Uses of DDT
DDT (p, p−dichlorodiphenyltrichloroethane)is one of the best known insecticides. It is very effective against mosquitoesand lice. But due its harmful effects, it was banned in the United States in1973.
Uses ofcarbontetrachloride (CCl4)
(i) It is used for manufacturing refrigerants andpropellants for aerosol cans.
(ii) It is used as feedstock in the synthesis ofchlorofluorocarbons and other chemicals.
(iii) It is used as a solvent in the manufacture ofpharmaceutical products.
(iv) Until the mid 1960’s, carbon tetrachloride waswidely used as a cleaning fluid, a degreasing agent in industries, a spotreamer in homes, and a fire extinguisher.
Uses of iodoform(CHI3)
Iodoform was used earlier as an antiseptic, but now ithas been replaced by other formulations-containing iodine-due to itsobjectionable smell. The antiseptic property of iodoform is only due to theliberation of free iodine when it comes in contact with the skin.