Chlorobenzene (abbreviated PhCl) is an aryl chloride and the simplest of the chlorobenzenes, consisting of a benzene ring substituted with one chlorine atom. Its chemical formula is C6H5Cl. This colorless, flammable liquid is a common solvent and a widely used intermediate in the manufacture of other chemicals.Chlorobenzene 99.5% AR (Analytical Reagent grade), also known as monochlorobenzene (MCB), is a high-purity aromatic organic solvent used for precise laboratory analysis and chemical synthesis. It is a clear, colorless, flammable liquid with a characteristic sweet, almond-like odor.