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100年 - 100 學士後西醫:有機化學#35480
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44. Which of the following is a nonreducing sugar (does not react with Tollens' reagent)?
答案:
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統計:
A(1), B(21), C(3), D(3), E(0) #1026929
私人筆記 (共 1 筆)
養樂多(MT112、後中上榜)
2024/06/25
私人筆記#6143717
未解鎖
還原糖:具有半縮醛(Hemiaceta...
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其他試題
40. In the mechanism for the dehydrohalogenation of 3-chloro-3,7-dimethyloctane, what is the dihedral angle between the hydrogen and chlorine atoms that are eliminated? (A) 0 degree (B) 45 degrees (C) 90 degrees (D) 135 degrees (E) 180 degrees
#1026925
41. Which reagent is used to accelerate coupling reactions in both laboratory peptide synthesis and laboratory DNA synthesis? (A) catalytic H (B) dicyclohexylcarbodiimide (C) sodium hydroxide (D) ethyl chloroformate (E) PhS- NH4+
#1026926
42. What reagent is used to convert pentanamide to 1-pentanamine? (A) POCl3 (B) CuCN (C) MeMgBr (D) SOCl2 (E) LiAlH4
#1026927
43. Which of the following reactions will not yield a ketone product?
#1026928
45. Formulas for four ethyl ethers are drawn below.Which two ethers are cleaved by aqueous acid much more easily than the other two? (A) I and II (B) II and III (C) III and IV (D) I and IV (E) III and IV
#1026930
46. The formula of brevicomin, a pheremone of the western pine beetle, is shown below. What open chain ketodiol would close to this bicyclic acetal? (ignore stereoisomer issues) (A) 7,8-dihydroxynonan-3-one (B) 6,7-dihydroxynonan-3-one (C) 7,8-dihydroxynonan-2-one (D) 6,7-dihydroxynonan-2-one (E) 6,7-dihydroxynonan-4-one
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47. Which of the following will be the kinetically favored product from the depicted reaction ?
#1026932
48. Which of the following alcohols undergoes dehydration upon heating with concentrated H2SO4 without carbocation rearrangement? (A) 2-methylhexan-3-ol (B) 3-methylpentan-3-ol (C) 3,3-dimethylpentan-2-ol (D) 2-methyl-2-phenylpropan-1-ol (E) both A and B
#1026933
49. Choose the reaction, or reaction sequence, that best accomplishes the preparation of 2-methylcyclohexanol.
#1026934
50. Alkoxymercuration followed by sodium borohydride reduction would be used to produce (A) alcohol from an alkene (B) aldehyde from alcohol (C) acid from an alkyne (D) ether from an alkene (E) alkene from an aryl halide
#1026935