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105年 - 105 學士後西醫:有機化學#78642
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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(44), 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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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.
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26. Compound X has the molecular formula C10H12O. The IR spectrum of X has a strong band near 1710 cm-1. Compound X forms a phenylhydrazone, but gives a negative Tollens’ test and a positive iodoform test. What is the structure of the compound X? (A) (B) (C)(D) (E)
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27. For the mass spectrum of compound Y, we found 3 lines in the molecular ion region (M+ , M+ +2, M+ +4), shows the peak heights in the ratio of 9 : 6 : 1. What would the compound Y be? (A) cis-1,2-Dichlorocyclohexane (B) 2-Chloropentane (C) cis-1,2-Dibromocyclohexane (D) Bromobenzene (E) 1,2-Dibromopentane.
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28. Which of the following would not produce nuclear magnetic resonance? (A) 2 H (B) 14N (C) 16O (D) 19F (E) 11B
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