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19. Which of the following resonance structures is the most stable?
(A)
(B)
(C)
(D)
(E)

答案：登入後查看
統計： A(2), B(0), C(1), D(1), E(0) #2055436

其他試題

15. Which of the following structures, would be classified as anti-aromatic? (A) (B) (C) (D) (E) all of the above

16. Which alkene has the lowest heat of hydrogenation ΔH°hydrog? (A) (B) (C) (D) (E)

17. Which of the following alkyl halides would be suitable to use when forming a Grignard reagent? (A) BrCH2CH2CH2CN (B) CH3COCH2CH2Br (C) (CH3) 2NCH2CH2Br (D) H2NCH2CH2Br (E) all of the above

18. Rank the following aromatics in order of decreasing reactivity toward electrophilic aromatic substitution (most reactive ＞ least reactive). (A)A ＞ C ＞ D ＞ B (B) D ＞ C ＞ A ＞ B (C) B ＞ C ＞ A ＞ D (D) D ＞ A ＞ C ＞ B (E) C ＞ A ＞ D ＞ B

20. Rank the following in order of decreasing acidity (more acidic ＞ less acidic): (A) II ＞ III ＞ I ＞ IV ＞ V (B) IV ＞ II ＞ I ＞ III ＞ V (C) II ＞ IV ＞ I ＞ III ＞ V (D) V ＞ III ＞ I ＞ II ＞ IV (E) II ＞ IV ＞ I ＞ V ＞ III

21. How would you rank the following in decreasing order of reactivity toward nucleophilic aromatic substitution? (most reactive on left) (A) 4 ＞ 1 ＞ 3 ＞ 2 (B) 2 ＞ 3 ＞ 1 ＞ 4 (C) 3 ＞ 2 ＞ 4 ＞ 1 (D) 1 ＞ 3 ＞ 2 ＞ 4 (E) impossible to predict

22. When you do an optical-resolution experiment of racemic mandelic acid you have to choice the reagent “________” theoretically. (A) pure achiral alcohol (B) pure racemic alcohol (C) pure (S)-amine (D) pure racemic amine (E) pure achiral amine

23. The following structure is Vitamin C. How many stereoisomers (including optical isomers) of Vitamin C are possible? (A) 2 (B) 3 (C) 4 (D) 6 (E) 8

24. Assign R or S configurations to the indicated centers in ascorbic acid. (A) a = (R), b = (R) (B) a = (R), b = (S) (C) a = (S), b = (R) (D) a = (S), b = (S) (E) none of them

25. Which of the following pair of compounds theoretically possible to be separated by distillation? (A) (B) (C) (D) (E) none of the above

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