= 4-Nitroaniline
{wiki}
= p-Nitroaniline
{synonym}
<4-Nitroaniline> is $\mathrm{H_2NC_6H_4NO_2}$ with amino and nitro groups opposite one another on a benzene ring. The electron-donating amino group and electron-withdrawing nitro group interact through the conjugated framework.
This arrangement affects visible/ultraviolet absorption and acid-base behavior. The positional descriptor matters: moving one group gives a different constitutional isomer, potentially with different spectra and intermolecular interactions.
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