Dichlorine monoxide
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Dichlorine monoxide, Cl2O, is a chlorine oxide.
Dichlorine monoxide is the anhydride of hypochlorous acid; it is related to hypochlorites generally.
It is also the unstable decomposition product of calcium hypochlorite, and in high concentrations presents the risk of ignition by friction or static spark.
Dichlorine monoxide melts at -120.6 °C and boils at 22 °C.