未分類

58. Which of the following is a suitable method for synthesizing only methyl vinyl ketone (CH3COCH=C

1. About the ionic liquids, which statement is true?(A) They dissolve both polar and nonpolar organi

59. Which of the following acids does not decarboxylate on heating?

60. Which of the following schemes will proceed to give the compound indicated as the major product.

61. Which of the following statement for Diels-Alder reaction is false?(A) Diels-Alder reaction is a

62. Choose the incorrect statement about the following acid/base reactions involving propyne and its

63. Which of the following compound does not contain carbonyl group(s) in its structure?(A) dicycloh

64. Which comopund has the smallest heat of hydrogenation?(A) 5-methyl-1,2-hexadiene (B) (E)-5-methy

65. The correct priority of functional groups in IUPAC nomenclature is:(A) acid > ester > amid

66. Structure I-IV may represent a conformation of 2,2-difluorobutane sighting along any C-C bond. P

67. Which of the following reactions of alkenes is not stereospecific?(A) bromohydrin formation (Br2

68. Which system would give the largest ratio of substitution to elimination product(s)?(A) cyclohex

69. Optically pure (S)-monosodium glutamate has a specific rotation of +25o, what percent of (R)-mon

70. What reagents can be used to convert 1-hexyne into 2-hexanone?(A) 1. Sia2BH; 2. H2O2, NaOH (B) H

71. Below is a propose a synthesis of compound A. Which step would not work.

72. The syntheses shown here are unlikely to occur as written. What is wrong with each?

73. Which of the reactions below would not produce n-butylamine ?

74. Determine the product of the synthetic sequence below.

75. A chiral C7H16O2 diol is oxidized by PCC in CH2Cl2 to an achiral C7H12O2 compound. Which of the

76. Which of the following molecules is chiral?

77. Stereoisomers I and II undergo E2 elimination on treatment with sodium ethoxide in ethanol. One

78. What product is wrong when carvone is treated with the following reagents?

79. What is the expected product from the reaction sequence drawn below?

80. Only one of the following amines will lose its nitrogen atom as trimethyl amine by repeated Hofm

2. When an SN2 reaction was carried out, under which of the following solvents would you expect acet

 3690   首頁 上一頁 32 33 34 35 36 37 38 39 40 41 下一頁 尾頁