Match the terms given in Column I with the compounds given in Column II.
| Column I | Column II |
| A. Acid rain | 1. |
| B. Photochemical smog | 2. |
| C. Combination with hemoglobin | 3. Unsaturated hydrocarbons |
| D. Depletion of the ozone layer | 4. |
Codes
| A | B | C | D | |
| 1. | 4 | 2 | 3 | 1 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 4 | 3 | 2 | 1 |
| 4. | 4 | 1 | 3 | 2 |
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