Sec and Iso term is used in ----------- nomenclature of alkyl halide.
Nomenclature of Alkyl Halides. Alkyl halides are formally derived from alkanes by exchanging hydrogen for halogen (fluorine, chlorine, bromine, and iodine). Depending on the degree of substitution at the carbon atom carrying the halogen, alkyl halides are classified into primary, secondary and tertiary alkyl halides. Depending on position of halogen Iso and Sec term is used common nomenclature.