| List-I (Sol) | List-II (Method of preparation) | 
|---|---|
| A) \( \text{As}_2\text{S}_3 \) | I) Bredig's arc method | 
| B) \( \text{Au} \) | II) Oxidation | 
| C) \( \text{S} \) | III) Hydrolysis | 
| D) \( \text{Fe(OH)}_3 \) | IV) Double decomposition | 

| List - I | List - II | 
|---|---|
| A) Morphine | IV) Pain killer | 
| B) Cannabinoids | V) Dopamine | 
| C) Cocaine | I) Cardiovascular system | 
| D) Benzodiazepines | II) Tranquilizers |