41. Many nucleophilic addition reactions of aldehydes and ketones are catalyzed by acid or base. Bas
42. Which of the following would produce a mixture of products when treated under appropriate condit
43. Which of the following statements correctly characterizes the following compound? (A) contains 6
49. What is the major organic product of the following reaction? (A) 4-ethyl-2,3-dimethylpyridine (B
50. Draw a Fischer projection of the product when (R)-2-bromobutane is treated with the following se
45. The 1H NMR spectrum of which of the compounds below, all of formula C7H12O2, would consist of th
51. Which of the reagents listed below would work best in the following reaction? (A) NaBH4 (B) LiAl
52. Which reactions on the right below will provide the diol on the left as the major product? (A) I
46. Arrange the following in order of increasing basicity: aniline, p-nitroaniline, p-toluidine, and
53. Provide a structure for the expected product of the following reaction. (A) I (B) II (C) III (D)
54. The 1H NMR spectrum of a compound with formula C7H14O shows two signals. Which one of the follow
55. What is the order of decreasing reactivity towards nucleophilic acyl substitution for the carbox
48. For the reaction shown, which of the compounds listed below would be the expected major, and fin
40. The following products were obtained from the oxidative cleavage of a diene. What is the structu
57. Predict the product for the following reaction sequence. (A) 2,4-heptanediol (B) 1,4-heptanediol