Which region in the IR spectrum could be used to distinguish between naproxen and diphenhydramine (Benadryl)?

Question

Quizplus · Accepted Answer

The region from 2400-3500 cm-1 is the region of interest for distinguishing between naproxen and diphenhydramine as it contains the stretching vibrations of N-H and O-H bonds which are present in diphenhydramine but not in naproxen. Therefore, the presence or absence of peaks in this region can be used to differentiate between the two compounds.

Which Region in the IR Spectrum Could Be Used to Distinguish