How would the following compounds be distinguishable using IR and ¹H NMR spectroscopy?

Question

Quizplus · Accepted Answer

The presence of two singlets in the ¹H NMR spectrum of compound I suggests two different sets of protons, which could be due to the presence of two different functional groups. This is supported by the higher wave number of the C=O absorption in the IR spectrum of compound I, indicating the presence of a more electronegative substituent, which could be responsible for one of the two sets of protons. Additionally, the ¹H NMR spectrum of compound II having a triplet at a chemical shift of about 4 does not provide any useful information for distinguishing between the compounds. Therefore, the best choice is D, which takes into account both the NMR and IR spectra.

How Would the Following Compounds Be Distinguishable Using IR and 1H

How Would the Following Compounds Be Distinguishable Using IR and ¹H