bromine monochloride bromine monochloride bromine monochloride, also called bromine(i) chloride, bromochloride, and bromine chloride, is an interhalogen inorganic compound with chemical formula brcl. it is a very reactive golden yellow gas with boiling point 5 °c and melting point −66 °c. its cas number is 13863-41-7, and its einecs number is 237-601-4. it is a strong oxidizing agent. bromine monochloride names other names bromine(i) chloridebromochloridebromine chloride identifiers cas number 13863-41-7 y 3d model (jsmol) interactive image chemspider 55600 y echa infocard 100.034.169 ec number 237-601-4 pubchem cid 61697 rtecs number ef9200000 unii 7g62xy5724 un number 2901 comptox dashboard (epa) dtxsid4035259 inchi inchi=1s/brcl/c1-2 ykey: codnyicxdisaea-uhfffaoysa-n yinchi=1/brcl/c1-2key: codnyicxdisaea-uhfffaoyaz smiles brcl properties chemical formula brcl molar mass 115.357 g/mol density 2.172 g/cm3 melting point −54 °c (−65 °f; 219 k) boiling point 5 °c (41 °f; 278 k) solubility in water 8.5 g/l hazards nfpa 704 (fire diamond) 3 0 2ox except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). y verify (what is yn ?) infobox references uses bromine monochloride is used in analytical chemistry in determining low levels of mercury, to quantitatively oxidize mercury in the sample to hg(ii) state. a common use of bromine monochloride is as an algaecide, fungicide, and disinfectant of industrial recirculating cooling water systems. addition of bromine monochloride is used in some types of li-so2 batteries to increase voltage and energy density.