Folder test bank is orgo chapter 7 ne wa

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Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangement of atoms that form the structure of molecules and their manipulation. An important branch of stereochemistry is the study of chiral molecules

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Folder test bank is orgo chapter 7 ne wa

  1. 1. Chapter 7 Stereochemistry
  2. 2. • 1. Which of the molecules below are chiral? • • • • A. B. C. D. only II only III I and III II and III
  3. 3. • 2. Which of the molecules below are chiral? • • • • A. B. C. D. only I I and III II and III I, II, and III
  4. 4. • 3. Identify the chiral compound(s) below. • • • • A. B. C. D. only II II and III III and IV I, II, and IV
  5. 5. • 4. Which of the following molecules are chiral? • • • • A. B. C. D. only II only III II and III I, II, and III
  6. 6. 5. How many stereogenic centers are there in the following molecule? A. B. C. D. only 1 two three four
  7. 7. 6. How many stereogenic centers are there in the following molecule? • • • • A. B. C. D. only 1 two three four
  8. 8. • 7. Give the configurations, respectively, of the following two molecules. • • • • A. B. C. D. R and R R and S S and S S and R
  9. 9. • 8. Give the configurations, respectively, of the following two molecules. • • • • A. B. C. D. R and R R and S S and S S and R
  10. 10. • 9. Which one of the following groups has the highest rank as assigned by the Cahn-IngoldPrelog system for stereogenic carbons? • • • • A. B. C. D. –CH=CH2 –CH2OH –CH=O –CH2SH
  11. 11. • 10. Give the configurations of carbons 1 and 2, respectively, in the structure shown below. • • • • A. B. C. D. R and R R and S S and S S and R
  12. 12. • 11. What is the IUPAC name of the following compound? • • • • A. B. C. D. (2S, 3S)-2,3-dibromopentane (2S, 3R)-2,3-dibromopentane (2R, 3S)-2,3-dibromopentane (2R, 3R)-2,3-dibromopentane
  13. 13. • 12. Which of the following statements are true? I. If a molecule has a plane of symmetry it is achiral. II. If a molecule has a center of symmetry it is achiral. III. If a molecule has one stereogenic center it is chiral. • • • • A. B. C. D. I and II I and III II and III I, II, and III
  14. 14. • 13. What is the relationship between the following two molecules? • • • • A. B. C. D. identical enantiomers diastereomers constitutional isomers
  15. 15. • 14. What are the configurations of carbons 2 and 3 in the Fischer projection below? • • • • A. B. C. D. 2R, 3R 2R, 3S 2S, 3R 2S, 3S
  16. 16. • 15. Compound X, C5H10O, is optically active. The compound consumes one equivalent of hydrogen to give C5H12O. The hydrogenation product is also optically active. Which compound below matches the information? • • • • A. B. C. D. A B C D
  17. 17. 16. A pure sample of (S)-phenylalanine has a specific rotation of +70 . A mixture of the two enantiomers of phenylalanine has a specific rotation of +7.0 . What are the percentages of the S and R enantiomers in the mixture? • • • • A. B. C. D. 95% S, 5% R 90% S, 10% R 55% S, 45% R 52.5% S, 47.5% R
  18. 18. • 17. How many stereoisomers are there for the compound shown below? • • • • A. B. C. D. two four six eight
  19. 19. • 18. Give the total number of stereoisomers of 2,3-dibromobutane. • • • • A. B. C. D. none, only a single structure two three four
  20. 20. • 19. What is the relationship between the following two compounds? • • • • A. B. C. D. identical enantiomers diastereomers constitutional isomers
  21. 21. • 20. What is the relationship between the following two compounds? • A. different conformations of the same compound • B. enantiomers • C. diastereomers • D. constitutional isomers

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