Nomenclature of Nitro Compounds
Nitro compounds are those derivatives of hydrocarbons in which a hydrogen atom is replaced by a nitro (–NO2) group. They may be aliphatic or aromatic. Nitroalkanes are divided into primary (1°), secondary (2°) or tertiary (3°) nitro alkanes depending upon the attachment of nitro group to primary, secondary or tertiary carbon atom, respectively.

IUPAC Nomenclature
According to IUPAC system, nitro compounds are named by prefixing the word nitro before the name of the parent hydrocarbon.