Phosgene, also called carbonyl chloride (COCl2), is a colorless,
reactive gas, hydrolyzed by water, made by catalytic combination of carbon
monoxide and chlorine, and used to
make resins and dyes.
Highly toxic, it was used as a poison gas in World War I. Boiling point
8.2°C (46.8°F), melting point -118°C (-180.5°F).