Chapter 2: Questions please answer all questions from A to E SCI 490 Natural Products Chemistry A). Previously, organic solvents such as benzene, chloroform, carbon tetrachloride, and hexane were very popular choices. Why are they no longer used? B). What are the most common solvents or combinations that are used in the natural products industry today? C). Using the answers for Question B, why are they chosen? D). Name any two of the four first extraction techniques. E). Name the ways to separate polar compounds and give some examples.