Homework 10 Choose 3 problems and solve the structure of the molecules according to the given spectra. Problems 1-3 class level, 4-6 advanced level. 1. C9H12O3 3 1 2 6 2. C8H7OBr 3 2 2 3. C12H14O4 6 2 2 4 4. C7H12O2 3 2 1 2 22 5. C6H8O 2 2 2 1 1 6. C9H10O 5 2 1 1 1