Ch 5 practice Q

Ch 5 practice Q - CHAPTER 5 1. Are you ready? Is your...

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CHAPTER 5 Are you ready? Is your seatbelt fastened? Here you go. 1. How many chiral centers are present in β -cadinene? CH 3 CH(CH 3 ) 2 H 3 C A) none B) 1 C) 2 D) 3 E) 4 Ans: 2. Counting all stereoisomers, how many monochlorinated products of the free-radical chlorination of ( R )-2-bromobutane are possible? (Note that the starting compound is one enantiomer only.) H 3 C CH 2 H 3 C Br H Cl 2 h ν ? A) 3 B) 4 C) 5 D) 6 E) 8 Ans: 3. Optically pure ( S )-monosodium glutamate has a specific rotation of + 24 ° . What specific rotation would ( R )-monosodium glutamate of 50% optical purity have? A) + 24 ° B) - 24 ° C) - 18 ° D) - 12 ° E) + 18 ° Ans: 4. What would be the complete name of the following? H 3 C C CH 2 C CH 3 CH 3 H Br H A) (2 R ,4 S )-2-bromopentane D) (2 R ,4 R )-2-bromo-4-methylpentane B) ( R )-2-bromo-4-methylpentane E) ( S )-2-bromo-4-methylpentane C) ( S )-4-bromo-2-methylpentane Ans: Page 1
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5. How many total stereoisomers of the following are possible? O OH O HO OH H H H HO A) 1 B) 2 C) 3 D) 4 E) 6 Ans: 6. How many total stereoisomers of the following are possible? HO 2 C CO 2 H OH CO 2 H A) 1 B) 2 C) 3 D) 4 E) 6 Ans: 7. How many total stereoisomers of the following are possible? O O OH HO H HO OH H A) 1 B) 2 C) 3 D) 4 E) 6 Ans: 8. Which of the following statements is not true? A) Enantiomers have identical properties except in chiral environments or with plane-polarized light. B) Reactions involving only achiral or racemic materials must produce achiral or racemic products. C) Diastereomers have identical properties in all environments. D) Enantiomers exhibit equal and opposite optical rotations. E) All of the above are true. Ans: Well, how are you doing? I hope you are getting many (most) of the answers right. If you have any specific problems, make a note of them and ask about them in the rview sessions next week Page 2
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9. How many stereogenic (chiral) centers are found in Rhizoxin? O
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Ch 5 practice Q - CHAPTER 5 1. Are you ready? Is your...

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