Practice+exam+chapter+5

Practice+exam+chapter+5 - R (e) meso 6. How many compounds,...

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(1) Indicate whether each of the following molecule pairs are (a) identical, (b) enantiomers, or (c) diasteriomers. (a) (b) (c) (d) (2) Draw the 3-dimensional representation for each of the following. (a) (2S,3S)-2-fluoro-3-methylhexane (b) (R)-1,1,2-trimethylcyclopentane
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(3) Write the complete IUPAC name for the following compounds. (a) (b) (4) Designate True (T) or False (F) for each of the following statements. (a) A sample of an optically active substance that consists of a single enantiomer is said to have an enantiomeric excess of 50%. (b) The (S) enantiomer of a chiral compound always rotates the plane of polarized light to the left. (c) The meso form of a molecule can be either dextrorotatory or levorotatory. (d) trans -1,4-dimethylcyclohexane is chiral but the cis -isomer is not. 5. The absolute configurations of the chirality centers in the following molecule are: (a) 2 R ,3 S (b) 2 R ,3 R (c) 2 S ,3 S (d) 2 S ,3
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Unformatted text preview: R (e) meso 6. How many compounds, including stereoisomers, could be referred to as dichlorocyclopropane? (a) 6 (b) 5 (c) 4 (d) 3 e) none of these 7. Which of the structures below represents ( S )-2-butanol? (a) (b) (c) (d) a & b (e) none of these 8. The relationship between A and B is: A B (a) conformers (b) constitutional isomers (c) diastereoisomers (d) enantiomers (e) none of these 9. Which of the following molecules is achiral? None of these 10. A 76% enantiomeric excess of the S enantiomer corresponds to which of the following compositions? (a) 76% S , 24% R (b) 52% S , 48% R (c) 84% S, 16% R (d) 76% S, 12%R, 12% racemic mixture (e) none of these 11. Which of the following are meso compounds? (a) I & V (b) II (c) III & IV (d) II & V (e) I, II & V 12. How many stereogenic centers does the molecule to the right have? (a) 6 (b) 7 (c) 8 (d) 9 (e) none of these...
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Practice+exam+chapter+5 - R (e) meso 6. How many compounds,...

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