| M Formula: | Cl2O |
| Properties: | |
| Yellow gas; strong, unpleasant odor. Fp −120C; bp 2.2C. Soluble in water and carbon tetrachloride. | |
| Derivation: | |
| Reaction of mercuric oxide and chlorine. | |
| Hazard: | |
| Explodes on contact with organic materials. Strong irritant to eyes, skin, and mucous membranes. | |
| Use: | |
| Chlorination. | |