MONOCHLOROACETIC ACID (MCA) (ClCH2CO2H) is a colorless or white crystalline solid, highly hygroscopic, sharp odor, inflammable, soluble in water and common organic solvent. MCA is organochlorine compound is a useful building-block in organic synthesis. SYNONYMS: Chloroacetic acid, Chloroethanoic acid, Monochloroethanoic acid, MCAA, MCA. IUPAC NAME: Chloroacetic acid SYSTEMATIC IUPAC NAME: Chloroethanoic acid CAS REGISTRY NUMBER: 79-11-8 EC NUMBER: 201-178-4 UN NUMBER: 1751