Which compound would you expect to see a broad absorption with two spikes around 3300 cm^-1 and a strong absorption at 1640 cm^-1?

Question

Quizplus · Accepted Answer

The broad absorption with two spikes around 3300 cm-1 is indicative of N-H stretching vibrations, which are present in the amide group (CONH) in compound A. The strong absorption at 1640 cm-1 corresponds to C=O stretching vibrations, which are also present in the amide group. Therefore, compound A is most likely to show this IR spectrum.

Which Compound Would You Expect to See a Broad Absorption