a. How can you tell by Infrared Spectroscopy that the reaction (Synthesis of an Active Ingredient in Tiger Balm: camphor) worked? How can you tell by ¹H NMR (proton nuclear magnetic resonance) that reaction worked?

b. In the ¹H NMR of the oil (limonene), assign the proton for the cyclohexene double bond and the isopropylene double bond. What feature enables you to do this assignment with confidence? How is using CO₂ fluid extraction green?