The common names of alkyl halides are derived by naming the alkyl group followed by the halide. Alkyl halides are named as halo-substituted hydrocarbons in the IUPAC system of nomenclature. Haloarenes are the common as well as IUPAC names of aryl halides. For dihalogen derivatives, the prefixes o-, m-, p- are used in common system but in IUPAC system, the numerals 1,2; 1,3 and 1,4are used.
