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2425e3 - Organic Chemistry II 2425 Sample Exam3A Cholestrol...

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Organic Chemistry II 2425 Sample Exam 3A Cholestrol 1
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CHEM 2425 Sample EXAM # 3A (Chapters 19-23) NAME____________________ Score: Part I - Multiple choice questions (45 points) Directions - please write your correct answer next to each question number in space provided . _____ 1. Which of the following is called an acyl group? A. R-COO- B. R-CO- C. R-CO-O-CO- D. C = O _____2. Which of the following used as a suffix of carbaldehyde in naming? CHO CHO CHO _____3. When two molecules of acetaldehyde combine to yield the hydroxyaldehyde, the product is known as _________. _____ 4. Aryl ketones are prepared by the following reaction. This reaction is called_________________. AlCl 3 / heat CO - CH 3 + CH 3 -CO Cl _____ 5. Which of the following is an example of an enamine? A. R 2 C =NR B. R 2 NH C. R 2 C = C R –NR 2 D. R 4 N + _____ 6. Aldehydes and ketones are reduced by NaBH 4 or LiAlH 4 to yield ___________ and _________ alcohols. 2
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_____7. Which of the following has the highest boiling point? _____ 8. Which of the following is the most acidic? _____9. Which of the following reagents is used for the following conversion? NO 2 CH 3 NO 2 COOH A. KMnO 4 , H 2 O, heat B. LiAlH 4 , THF /H 3 O + C. CrO 3 /H 3 O + D. BH 3 , THF /H 3 O + ____ 10. Alpha- bromination of carboxylic acid by a mixture of Br 2 and PBr 3 is called _____________ . A. Hell-Volhard Zelinskii (HVZ) reaction B. Claisen- condensation reaction B. Robinson annulation D. Michael reaction ____ 11. Which of the following is an example of diazonium ion? ____12. The reaction of carboxylic derivatives by an organometallic reagent to yield an alcohol is called
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