Final answer:
Primary amines appear as a characteristic peak in the range of 3300-3500 cm-1 in the IR spectrum due to the stretching of the N-H bond.
Step-by-step explanation:
In the IR spectrum, primary amines appear as a characteristic peak in the range of 3300-3500 cm-1. This peak is due to the stretching of the N-H bond in the primary amine functional group.
For example, if we take the primary amine compound ethylamine (CH3CH2NH2), we would expect to see a strong peak at around 3300-3500 cm-1 in its IR spectrum.
Other compounds that contain primary amines, such as methylamine (CH3NH2) and propylamine (CH3CH2CH2NH2), would also exhibit this characteristic peak.