Final answer:
Primary amines in IR spectroscopy can be identified by the presence of a broad peak around 3300-3500 cm-1, attributed to N-H stretching vibration.
Step-by-step explanation:
A primary amine is classified as such when it has one alkyl or aryl group directly bonded to the nitrogen atom. This can be observed in the IR spectrum by looking for specific absorbance peaks. Primary amines typically exhibit a broad peak in the region of 3300-3500 cm-1, which is attributed to the N-H stretching vibration.
An example of a primary amine is methylamine (CH3NH2). In its IR spectrum, a broad peak can be observed around 3400 cm-1, indicating the presence of the N-H bond.
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