Chapter 3: Functional Groups: Analysis by Infrared Spectroscopy 33 Some Assembly Required Predicting IR spectra: 1. In Chapter 2, you used hexanes and acetone as solvents for your mobile phase in TLC. a. Draw the structure of hexane and acetone. b. Explain how you could use IR to differentiate between hexanes and acetone. c. Sketch the predicted IR spectrum of acetone in the space below. 2. In Chapter 2, you ran TLC plates of benzil and benzoin. a. Draw the structures of benzil and benzoin. b. Explain how you could use IR to differentiate between benzil and benzoin. c. Sketch the predicted IR spectrum of benzoin