Ozone layer in upper atmosphere is being destroyed by:

Explanation

This option is correct. The ozone layer in the upper atmosphere can be depleted or destroyed by certain substances known as ozone-depleting substances (ODS). The primary culprits responsible for ozone layer depletion are chlorofluorocarbons (CFCs), halons, carbon tetrachloride, methyl chloroform, and bromine-containing compounds such as bromofluorocarbons (BFCs) and hydrochlorofluorocarbons (HCFCs).When these ozone-depleting substances are released into the atmosphere, they can rise to the stratosphere, where the ozone layer is located. There, they undergo photodissociation due to the absorption of high-energy ultraviolet (UV) radiation from the sun. This process releases chlorine and bromine atoms, which act as catalysts in the destruction of ozone molecules.The chlorine and bromine atoms can undergo catalytic reactions with ozone, breaking down ozone molecules and reducing the overall concentration of ozone in the ozone layer. This leads to the thinning or depletion of the ozone layer, particularly in regions like the ozone hole over Antarctica.Freon is a common name used to refer to a group of chlorofluorocarbon (CFC) compounds. CFCs were widely used as refrigerants, propellants in aerosol products, and solvents in various industrial applications.Unfortunately, CFCs like Freon, specifically chlorofluorocarbon-12 (CFC-12) or dichlorodifluoromethane (CCl2F2), have been identified as potent ozone-depleting substances (ODS). When released into the atmosphere, CFCs can eventually reach the stratosphere, where they undergo photodissociation due to the absorption of high-energy ultraviolet (UV) radiation. This process leads to the release of chlorine atoms, which act as catalysts in the destruction of ozone molecules.