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| Column-$I$ | Column-$II$ |
| $(A)$ Acid rain | $(1)$ $CHCl_2-CHF_2$ |
| $(B)$ Photochemical smog | $(2)$ $CO$ |
| $(C)$ Combination with hemoglobin | $(3)$ $CO_2$ |
| $(D)$ Depletion of ozone layer | $(4)$ $SO_2$ |
| $(5)$ Unsaturated hydrocarbons |
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