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105年 - 105 學士後西醫：有機化學#78642
> 試題詳解
28. Which of the following would not produce nuclear magnetic resonance?
(A)
2
H
(B)
14
N
(C)
16
O
(D)
19
F
(E)
11
B
答案：
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統計：
A(3), B(1), C(42), D(1), E(1) #2053825
私人筆記 (共 1 筆)
台中孔乙己
2021/04/07
私人筆記#2956383
未解鎖
不能用在NMR:質子數與中子數皆為偶數者...
(共 21 字，隱藏中）
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其他試題
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
25. Which of the following carbonyl groups exhibits the highest wavenumber in infrared spectroscopy? (A) (B) (C) (D) (E)
#2053822
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)
#2053823
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.
#2053824
29. Which compounds have 3 signals in the 13C NMR spectrum? (A) I, II (B) III, IV (C) I, II, III (D) I, III, IV (E) I, II, III, IV
#2053826
30. Using a 300 MHz 1 H NMR instrument, if a H shows a triplet at δ 4.02, 4.00, 3.98 ppm, please calculate it’s coupling constant. And where will this triplet peak shows up at a 600 MHz 1 H NMR instrument? (A) 6 Hz; δ: 4.01, 4.00, 3.99 ppm (B) 6 Hz;δ: 4.02, 4.00, 3.98 ppm (C) 6 Hz; δ: δ: 4.00, 3.98, 3.96 ppm (D) 2 Hz; δ: 4.02, 4.00, 3.98 ppm (E) 2 Hz; δ: 4.00, 3.98, 3.96 ppm.
#2053827
31. Consider the reaction below, how many pairs of electrons are involved in this pericyclic reaction? (A) 2 (B) 4 (C) 8 (D) 16 (E) 10
#2053828
32. Which of the following reaction types are pericyclic reactions? (A) Diels-Alder reaction (B) Cope rearrangement (C) Claisen rearrangement (D) Stork reaction (E) All except {D}are pericyclic reactions.
#2053829
33. What is the order of decreasing reactivity towards nucleophilic acyl substitution for the carboxylic acid derivatives? (most reactive first) (A) I, III, II, IV (B) II, III, I, IV (C) III, II, I, IV (D) IV, I, III, II (E) IV, III, I, II
#2053830
34. Consider the elimination reaction: 2-bromohexane was treated with sodium methoxide in methanol. The product(s) of the reaction is(are): (A) (B) (C) An equimolar mixture of {A} and{B} (D) A mixture of the major product {A}with the minor product {B} (E) A mixture of the major product{B} with the minor product{A}.
#2053831
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