What is the structure of the compound in the following ¹H-NMR spectrum with the molecular formula C₄H₈O? Relative integration is shown.

Question

Quizplus · Accepted Answer

The molecular formula indicates that there are 14 carbon atoms, so the compound must contain at least 14 distinct carbon environments. The NMR spectrum shows 14 distinct peaks, which confirms this. 
The presence of a singlet at 2 ppm with an integration of 3 indicates a methyl group. Similarly, the presence of a singlet at 3 ppm with an integration of 3 indicates a methoxy (OCH3) group. These signals are present in choice D, but not in the other choices. Additionally, the number of protons in the other peaks matches the integrations in the molecular formula, further supporting choice D as the correct answer.

What Is the Structure of the Compound in the Following