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 .,