Propose a structure for a compound with molecular formula CaH10O2 and the following 1H NMR spectroscopy chemical shifts and multiplicities. (For full credit, show your work, calculate HDI, assign each peak to the protons of your structure and give your reasons specifically): At 1.2 ppm (triplet, 3H) At 2.10 ppm (singlet, 3H) At 2.56 ppm (quartet, 2H) At 3.4 ppm (singlet, 2H)