PracticeEXIIIF11

PracticeEXIIIF11 - FLORIDA INTERNATIONAL UNIVERSITY...

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FLORIDA INTERNATIONAL UNIVERSITY Department of Chemistry & Biochemistry CHM 2210-U01 – ORGANIC CHEMISTRY I Fall 2011 PRACTICE EXAM III Dr. Keller
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CHM 2210-U01 Fall 2011 Practice Exam III, Page 2 FLORIDA INTERNATIONAL UNIVERSITY Department of Chemistry Dr. Keller PRACTICE EXAM III CHM 2210-U01 Fall 2011 1. The most stable conformation of 2,3- dimethylpentane, viewed through the C2-C3 bond, ( i.e., C2 in front, C3 in the back) is: H CH 3 CH 2 CH 3 CH 3 CH 3 H CH 3 CH 2 CH 3 H CH 3 CH 3 H H CH 3 H CH 3 CHCH 3 H H CH 3 CH 3 H CHCH 3 CH 3 H CH 3 CH 3 H CH 2 CH 3 H CH 3 CH 3 a. b. c. d. e. 2. Which of the following will have the same energy after undergoing a ring flip? OH HO Cl CH 3 F Br HO CH 3 CH 2 CH 3 CH 2 CH 3 a. b. c. d. e. 3. How are the following compounds related? Br Br CH 3 CH 3 Br Br CH 3 CH 3 H H H H a. diastereomers b. enantiomers c. meso compounds d. same compound e. not related 4. A racemic mixture of enantiomers will rotate plane-polarized light: a. 0 degrees b. 180 degrees c. need more information to know. d. there is no such thing as a racemic mixture of enantiomers. e. none of the above 5. trans -1,2-dibromocyclohexane is represented by which structure(s)? Br H Br H H Br H Br Br H H Br I II III a. I b. II c. III d. II and III e. I and II
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Practice Exam III, Page 3 6. The following Newman projection represents which molecule? CH 3 CH 2 H H CH 2 CH 3 H H a. Pentane b. Butane c. 3-Ethylbutane d. Hexane e. 3-Methylpentane 7. Optically pure (S)-glutamic acid has a specific rotation of +24˚. What specific rotation would (R)-glutamic acid of 50% optical purity have? a. +24˚ b. -24˚ c. -18˚ d. -12˚ e. +18˚ 8. What would be the complete name of the following? C C CH 3 CH 3 CH 3 H Br H CH 2 a. (2R,4S)-2-Bromopentane b. (R)-2-Bromo-4-methylpentane c. (S)-4-Bromo-4-methylpentane d. (2R,4R)-2-Bromo-2-methylpentane e. (S)-2-Bromo-4-methylpentane 9. The following Newman projection represents which molecule? H CH 3 CH 2 CH 2 CH 3 CH 2 CH 3 CH 3 CH 3 CH 2 CH 2 CH 3 CH 3 a. b. c. d. e. 10. Which would be the most stable conformation of trans -1-methyl-3- isopropylcyclohexane? CH
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This note was uploaded on 12/22/2011 for the course CHEMISTRY 2210 taught by Professor Keller during the Spring '11 term at FIU.

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PracticeEXIIIF11 - FLORIDA INTERNATIONAL UNIVERSITY...

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