A coumpound with Formula C10H120 displayes a strong IR stretch at 1686 cm-1. There are no strong IR absorptions greater in energy than the C-H stretches. It posseses the following NMR data: 1.21 ppm (3H, triplet), 2.39 ppm (3H, singlet), 2.95 ppm (2H, quartet), 7.24 ppm (2H, doublet), 785 ppm (2H, doublet). Please check all boxes which are consistent with the structure from which this data was derived. ketone Index of H deficiency = 4 not aromatic Index of H deficiency - 6 Index of H deficiency 3 At least one ethyl group No ethyl groups alcohol aldehdye Index of H deficiency - 5 aromatic