Which of the following compounds does not show only one signal in its ¹H NMR spectrum? A)I B)II C)III D)IV

Question

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Compound II has three different types of protons: the methyl protons (3H) appear around 1.5 ppm, the methylene protons (2H) appear around 2.5 ppm, and the olefinic protons (2H) appear around 5-6 ppm. Therefore, it shows three signals in its ¹H NMR spectrum. The other compounds have only one type of proton and thus show only one signal in their spectra.

Which of the Following Compounds Does Not Show Only One