The replacement of hydrogen atom( s) in hydrocarbon, aliphatic or aromatic, by halogen atom( s) results in the formation of alkyl halide( haloalkane) and aryl halide( haloarene), respectively.
Classification of Halogen Derivatives
On the basis of number of halogen atoms present, halogen derivatives are classified as mono, di, tri, tetra, etc., halogen derivatives, e. g.,
On the basis of the nature of the carbon to which halogen atom is attached, halogen derivatives are classified as 1 °, 2 °, 3 °, allylic, benzylic, vinylic and aryl derivatives, e. g.,