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CHM2526_Final Exam 2000 - 1 FINAL EXAM CHM 2526 Professor...

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1 FINAL EXAM CHM 2526 Professor: Dr. Louis Barriault Date: December 18, 2000 Time: 3 hours Name: Student #: 1. Using a flowchart, describe a method to separate the following mixtures. (10 points) A) NH 2 CO 2 H NH 2 NH 2 B)
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2 2. During the bromination of cholesterol, you added a bromine solution dropwise (red- brown colour). At first during the addition, the reaction mixture quickly returns to its original colour, but after a certain quantity of bromine is added, the red-brown colour persists. Briefly explain this observation. (5 points) 3. You are given a mixture of benzyl alcohol and isopropyl benzoate. A TLC of the mixture is drawn below (eluant : 20% ethyl acetate/hexanes). (10 points) A) Calculate the R f of A et B. (4 points) B) What corresponds to B (alcohol or ester)? Briefly explain your answer. (6 points) 4. Polystyrene has the structure given below. Give the structure of the monomer. (5 points) Ph Ph Ph n 5. What is the role of benzoyl peroxide in the polymerization of methyl methacrylate? (5 points) A B
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3 6. During the preparation of "slime", you used borax (sodium tetraborate). What is its
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