Nitro group
= Nitro group
A <nitro group> is the functional group $\mathrm{-NO_2}$ attached through nitrogen. Its bonding is described using delocalization and charge-separated resonance forms rather than two independent ordinary nitrogen-oxygen double bonds.
It commonly withdraws electron density from an attached organic framework. This can alter aromatic substitution patterns, acidity of neighboring carbon-hydrogen groups, and optical properties in conjugated molecules.