Chlorofluorocarbons (CFC) is a molecule made of chlorine, fluorine and carbon atoms. It's a stable but dangerous molecule. It used to be used in refrigerators, freezers and aerosol cans. It had been used as coolant in refrigerator propellants in aerosol sprays. It has been used as early as the 1930's.
To find out why it's dangerous you first have to understand what Chlorofluorocarbons is. As I stated earlier it's made of chlorine fluorine and carbons. But it's also made of halogens which when combine with chlorine is extremely reactive. It combines to form CCL2f2 and CCL3F it becomes useful and desirable.
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