3. Structure determination. The data shown below is for a molecule with a mass of 148 . Your primary task is to determine the chemical structure of the molecule. Partial credit will be awarded as described below. (37pt) Grading: - Propose a reasonable molecular formula ( 6pt) - Calculate degrees of unsaturation for your molecular formula ( 6pt) - Make at least 2 peak assignments for each spectrum (22pt3 spectra =12pt) - Propose a structure that is consistent with the data (13 pt) Propose a structure that is consistent with the data (13 pt) Wavenumber (cm1) Proposed molecular formula: Degrees of unsaturation: Proposed structure