The UV spectrum of an unknown compound shows values of λmax at 225 nm (ε = 10,000) and at 318 nm 1e = 402. The mass spectrum shows a molecular ion at m/z 96 and a prominent base peak at m z68. The IR and NMR spectra follow.
Propose a structure, and show how your structure corresponds to the observed absorptions. Propose a favorable fragmentation to account for the MS base peak at m/z 68 (loss of C2H4).

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wavelength (um) 7 8 9 0 12 13 14 15 16 2.5 100 3.5 4 4.5 5.5 6 T 18-67 60 N 4000 3500 3000 2500 2000 1800 600 1400 1200 1000 wavenumber (cm) 800 600 180 160 140 120 100 0 Problem 18-67 10 δ (ppm)