Bromochloromethane

Bromochloromethane or methylene bromochloride and Halon 1011 is a mixed halomethane. It is a heavy low-viscose liquid with refractive index is 1.4808.

It was used in fire extinguishers, but due to its ozone depletion potential was its production banned from the 1st January 2002 at the Eleventh Meeting of the Parties for the Montreal Protocol on Substances that Deplete the Ozone Layer.

It can be biologically decomposed using hydrolase enzyme alkylhalidase (EC 3.8.1.1) by reaction:

CH2BrCl + H2O = CH2O + Br2 + Cl2.

In fiction
In the Enter the Matrix video game, the player can find a "Chloro-Bromo Methane Gun", which is used as a fire extinguisher. It fires a pressurized cartridge of CBM gas to put out fires. However, due to its chemical properties, firing a cartridge near people causes their lungs to fill with liquid, effectively drowning them.