Compound O has molecular formula C10H12O and shows an IR absorption of 1687cm1. The 1H NMR spectrum of O is given below. What is the structure of O ? Bonus Question (5 points) Treatment of compound D with LiAlH L4 followed by H2O forms compound E. D shows a molecular ion in its mass spectrum at m/z=71 and IR absorption at 36003200 and 2263cm1. E shows a molecular ion in its mass spectrum at m/z=75 and IR absorption at 3636 and 36003200cm1. Propose structure for D and E from these data and the given 1H NMR spectra