Folder test bank is orgo chapter 9 ne wa

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In organic chemistry, an alkyne is an unsaturated hydrocarbon which has at least one carbon—carbon triple bond between two carbon atoms.[1] The simplest acyclic alkynes with only one triple bond and no other functional groups form a homologous series with the general chemical formula CnH2n-2. Alkynes are traditionally known as acetylenes, although the name acetylene also refers specifically to C2H2, known formally as ethyne using IUPAC nomenclature. Like other hydrocarbons, alkynes are generally hydrophobic but tend to be more reactive

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Folder test bank is orgo chapter 9 ne wa

  1. 1. Chapter 9 Alkynes
  2. 2. • 1. What is the IUPAC name of the following compound? • • • • A. B. C. D. 5-propyl-3-heptyne 5-isopropyl-3-heptyne 5-ethyl-3-octyne 4-ethyl-5-octyne
  3. 3. • 2. Which of the following describes the orbital overlap of the C(1) - C(2) sigma bond of 1butyne, shown below? • • • • A. B. C. D. sp-sp sp2-sp2 sp3-sp3 2p-2p
  4. 4. • 3. Which of the following gives only one organic product on ozonolysis? • • • • A. B. C. D. 2-hexene 3-hexene 2-heptene 3-heptene
  5. 5. 4. What is the IUPAC name of the following compound? • • • • A. B. C. D. 2-methyl-5-propyl-3-heptyne 1-isopropyl-3-propyl-1-pentyne 5-ethyl-2-methyl-3-octyne 4-ethyl-7-methyl-5-octyne
  6. 6. • 5. Which one of the following describes the C(2)-C(3) sigma bond in the structure below? • • • • A. B. C. D. sp-sp sp2-sp2 sp3-sp3 2p-2p
  7. 7. • 6. Select the best base to quantitatively remove a proton from acetylene. • • • • A. B. C. D. NaNH2 NH3 NaOH NaOCH2CH3
  8. 8. 7. Arrange the following in order of decreasing base strength (strongest base first). • • • • A. B. C. D. IV > III > II > I II > III > I > IV I > II > IV > III II > III > IV > I
  9. 9. 8. Predict the major product(s) in the reactions below. • • • • • A. B. C. D. 1-nonyne 2-nonyne cis-2-nonene trans-2-nonene
  10. 10. • 10. Which sequence of reactions works best in synthesizing cis-3-nonene? • • • • A. B. C. D. A B C D
  11. 11. • 11. Which sequence of reactions below works best in carrying out the following conversion? • • • • A. B. C. D. (1) HBr (1) Br2 (1) Br2, H2O (1) H2O, H2SO4(cat.) (2) excess NaNH2 (2) excess NaNH2 (2) excess NaNH2 (2) excess NaNH2
  12. 12. • 12. Which of the following is the enol intermediate in the acid-catalyzed addition of water to propyne? • • • • A. B. C. D. A B C D
  13. 13. 13. Which reagent below would be used to convert 2-pentyne to trans-2-pentene? • • • • A. B. C. D. NaNH2, NH3 Na, NH3 H2, Lindlar Pd H2O, HgSO4/H2SO4
  14. 14. 14. Select the best method to carry out the following conversion. • • • • A. B. C. D. A B C D
  15. 15. 15. Which of the following is the correct IUPAC name of the product for the reaction shown below? • • • • A. B. C. D. cis-2-methyl-5-heptene trans-2-methyl-5-heptene cis-6-methyl-2-heptene trans-6-methyl-2-heptene
  16. 16. • 16. Identify compound Y. • A. 2-bromobutane • B. meso-2,3-dibromobutane • C. racemic (2R,3R) and (2S,3S)-2,3dibromobutane • D. 2,3-dibromo-2-butene
  17. 17. • 17. When a terminal alkyne is treated with sodium amide, NaNH2, in liquid ammonia, sodium amide acts as a • • • • • A. B. C. D. Brønsted acid. Brønsted base. reducing agent. catalyst.
  18. 18. 18. When alkynes are treated with sodium metal, Na, in liquid ammonia, sodium acts as a • • • • A. B. C. D. Brønsted acid. Brønsted base. reducing agent. catalyst.
  19. 19. • 19. Select the best reaction sequence to make the following ketone. • • • • A. B. C. D. A B C D

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