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

The range of 2.0-2.5 ppm in the ¹H NMR spectra corresponds to the chemical shift of protons attached to a carbon atom next to a carbonyl group (C=O). Therefore, the substances containing such groups in their structure would exhibit two singlets in this range. Looking at the structures given, substances I, II, III, and V all contain a C=O group, hence they would exhibit two singlets in the given range. Substance IV does not contain a C=O group and therefore would not show any signals in this range.

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

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