In the ¹H NMR spectra of which of the following substances,C₉H₁₀O,would you expect to see two singlets in the range of $\delta$2.0-2.5 ppm?

Question

Quizplus · Accepted Answer

In ¹H NMR spectra, the range of 2.0-2.5 ppm is typically associated with protons on carbons adjacent to carbonyl groups (C=O). Substances I, II, and III all contain carbonyl groups in their structures, so it is reasonable to expect two singlets in this range. Substance IV does not contain any carbonyl groups, so it would not exhibit any peaks in this range. Substance V contains a carbonyl group, but it is not adjacent to any protons, so it would not exhibit peaks in this range. Therefore, the best choice is (B) I, II, and III.

In the 1H NMR Spectra of Which of the Following δ\deltaδ

In the ¹H NMR Spectra of Which of the Following $\delta$