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105年 - 105 學士後西醫:有機化學#78642
> 試題詳解
18. In humans, most steroids function as:
(A) Enzymes
(B) Hormones
(C) Nucleic acids
(D) Proteins
(E) Saccharides.
答案:
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統計:
A(1), B(43), C(1), D(4), E(1) #2053815
私人筆記 (共 1 筆)
涵涵(邀請碼107252)
2023/03/03
私人筆記#4920074
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14. Find the energy cost of a 1,3-diaxial interaction for the following compounds, which has most 1,3-diaxial interaction energy? Assume the following 1,3-diaxial strains. (A) Isopropylcyclohexane (B) Fluorocyclohexane (C) Cyclohexanecarbonitrile (D) cis-1-Chloro-2-methylcyclohexane (E) trans-1-Chloro-2-methylcyclohexane.
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15. Which of the following species is the least nucleophilic? (A) Me3CO (B) H2O (C) Me3N (D) BF3 (E) CN
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16. What is the correct structure for α-D-glucopyranose? (A) (B) (C) (D) (E)
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17. Which of the following is a correct representation of the amino acid below? (A) Isoleucine (B) Ile (C) I (D) All of these represent this amino acid (E) Either {A},{B}, or {C}represent this amino acid.
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19. What is the IUPAC name of the following compound? (A) (2S,4R)-Dimethylpentanal (B) (2S,4S)-Dimethylpentanal (C) (R)-2,4-Dimethylpentanal (D) (S)-2,4-Dimethylpentanal (E) (2R,4R)-Dimethlypentanal.
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20. How many E configuration are there in the following compounds? (A) 1 (B) 2 (C) 3 (D) 4 (E) 5
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21. If silver nitrate is converted into silver nanoparticles, the most possible process for such a conversion is? (A) Exposure to oxygen (B) Exposure to heat (C) Exposure to water (D) Exposure to alcohol compound (E) Exposure to acid compound.
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22. A compound with the following molecular formula contains two double bonds. What is the correct subscript for H in the formula? C10H?ClN2O (A) 19 (B) 22 (C) 18 (D) 20 (E) 21
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23. When butane undergoes free radical bromination, the product mixture contains 98% 2-bromobutane and 2% 1-bromobutane. How many times more susceptible to hydrogen atom abstraction is a secondary hydrogen in butane than is a primary hydrogen? (A) 100 (B) 73.5 (C) 50 (D) 8.7 (E) 1.5
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24. Which of the following is not a property of a protecting group? (A) Change the reactivity of a functional group (B) Inert to reaction conditions (C) Becomes a permanent part of the product (D) Alters the mechanism of the desired reaction (E) All of these are properties of a protecting group.
#2053821