1 Organic Chemistry II Exam II (150 pts) Spring 2013 ... - Courses

3. Please give the structure of the compound with the following molecular formula: C8H8O3 a. IR data: i. 3500-­‐2500cm -­‐1 ii. 1710 cm -­‐1 1H b. NMR data: 4.7 ppm (singlet, 2 H) 6.9-­‐7.3 ppm (multiplet, 5 H) 11.3 ppm (singlet, 1 H) 4. The natural abundances of chlorine's two major isotopes are 35Cl (75.5%) and 37Cl (24.5%). If the mass spectrum of chlorobenzene contains a peak at m/z 114 with an abundance of 15.0%, calculate the % abundance of the peak at m/z 112. 2