A compound of formula C11H16N2 gives the IR, 1H NMR, and 13C NMR spectra shown. The proton NMR peak at δ 2 disappears on shaking with D2 Propose a structure for this compound, and show how your structure accounts for the observed absorptions.

A compound exhibits the following 13C NMR spectrum. 8 220.16, 38.31, 23.31 Which of the compounds listed below would be consistent with this structure?

The 1H-NMR spectrum of Compound C shows five signals – δ 2.38 (1H, dt), 2.72 (1H, dt), 5.34 (1H, t), 5.49 (2H, ddd), 6.27 (2H, dd) ppm. Its 13C-NMR spectrum has four signals – δ 26, 58, 127, 129 ppm. In the compound’s mass spectrum, the M+1 peak appears at m/z = 115. An M+2 peak, whose intensity is roughly one-third that of the M+1 peak, also appears. Suggest a structure for this compound.

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