1. Benzene diazonium chloride is treated with uoroboric acid to get benzenediazonium uoroborate which when heated with aqueous sodium nitrite solution in the presence of copper, nitrobenzene is formed.
2. When benzenediazonium chloride is coupled with aniline in acid medium, paminoazobenzene (an yellow azo dye) is formed.
3. It can be used as intermediate for the synthesis for many organic compounds.