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| 1. |
Due to depletion of ozone layer, chlorofluorocarbons (CFCs or freons-12) are being phased out as refrigerants, and propellants? Suggest some substitutes. |
| Answer» Solution :Substitutes for CHLOROFLUOROCARBONS or freon-12 are are hydrochlorofluorocarbons (HCFCs) such as `CHClF_(2)` (also CALLED freon-22) and `CHCl_(2)F` and hydroluorocarbons (HFCS) such as `FCH_(2)CH_(2)F` (HFC-152). Due to rpesence of C-H bonds, both these types of COMPOUNDS are generally destroyed at lower altitudes beore they reach the stratosphere. | |