1. An unknown sample has a large IR absorption at 2950cm1. Without knowing anything else about the molecule, including its formula, what bond type would you expect to find in this molecule? (5 points) 2. Based on what you know about the position of absorption peaks, which bond has a lower frequency of stretch vibration, OH or C=O ? Explain. (5 points) 3. Use the table of average bond energies to find the weakest bond in methylamine (CH3NH2. look up its structure online). If the weakest bond is broken, what are the masses of the fragments that are created, and is this reflected by its mass spectrum in the Webbook? ( 5 points) 4. If you did not have access to a database of molecular spectra, would an infrared spectrum by itself be useful in identifying an unknown substance? Explain. ( 6 points)