Final answer:
Aromatic carbons in 13C NMR spectra typically appear in the 110-160 ppm region, depending on the nature and position of substituents as well as the solvent used.
Step-by-step explanation:
Aromatic carbons appear in the 13C NMR spectra typically showing chemical shifts in the region of 110-160 ppm. This can vary slightly depending on factors such as electron-donating or electron-withdrawing groups attached to the aromatic ring. For example, carbons in phenyl groups themselves appear around 128-140 ppm whereas those in substituted benzene rings, such as nitrobenzene or aniline, may appear at slightly higher or lower ppm values, respectively, because of the electron-withdrawing or electron-donating nature of the substituents.
The position can also be affected by the solvent used in the NMR spectroscopy, with common solvents being CDCl3 and DMSO. The indicated chemical shifts are relative to these solvents (77.16 ppm for CDCl3 and 39.52 ppm for DMSO in 13C-NMR).