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110年 - 110 國立臺灣大學_碩士班招生考試_部分系所:有機化學(A)#102031
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7. How many of the following assignments is/are correct?
(A)0
(B)1
(C)2
(D)3
答案:
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統計:
尚無統計資料
相關試題
1.How many chiral centers can be found in the structure of Taxol drawn below? (A)10 (B) 11 (C)12 (D) 13
#2788402
2. How many of the following statements is/are correct? (I) Gauche form is the most stable conformer of butane. (II) In cyclopropane, the maximum electron density between two carbon atoms corresponds to the internuclear axis. (III) According to Bacyer strain theory, cyclopentane has greater angle strain than cyclohexane. (A)0(B)1 (C)2 (D)3
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3. How many of the following statements is/are correct? (I) The cis form of 1,3-dimethyI cyclohexane is more stable than the trans form. (Il) In cyclohexane, the boat form conformer is more stable than the twist-boat forn. (III) The 1,3-diaxal interaction in cyclohexane is mainly resulted from the torsional strain. (A)0(B)1 (C)2(D) 3
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4.How many of the following statements is/are correct? (I) Meso-tartaric acid can rotate plane polarized light. (Il) Nitrogen and sulfur atoms can be chiral centers. (III) A racemic mixture can't rotate plane polarized light. (A)0 (B)1 (C)2 (D)3
#2788405
5.How many of the following statements is/are correct? (I) Normally, aryl and vinyI halides are good substrates for SN2 reactions. (II) SN2 and SN1 reactions prefer protic and aprotic solvents, respectively. (III) Both E1 and SN1 reactions produce carbocations in their reaction pathways. (A)0 (B)1 (C)2 (D)3
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6.How many of the following statements about 1-bromo-2-methyI cyclohexane is/are correct? (I) The cis form is more stable than the trans form. (II) Using base to eliminate the trans form should afford lots of Hoffinan product.(II) Using base to eliminate the cis form should majorly afiord Zaitsev (or Sayizeff) product. (A)0 (B)1 (C)2 (D)3
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8.Which of the listed molecules has the highest frequency of the HOMO→ LUMO transition? (A)(B) (C)(D)
#2788409
9. About the following transformation, how many of the statements is/are correct?(I) Step (I) is a homogeneous catalytic reaction. (Ⅱ) The major product in step (2) has a boron atom attached to the benzylic position. (Ⅲ) Product P is a primary alcohol. (A)0 (B)1 (C)2 (D)3
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10. How many of the following compounds is/are aromatic? (A)1 (B)2 (C)3 (D)4
#2788411
11. How many of the following compounds is/are more basic than triethylamine?(Ⅰ ) pyridine (II) pyrole (IIl) sodium methoxide (IV) lithium diisopropylamide (A)1 (B)2 (C)3 (D)4
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