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28. Assign E or Z configuration to these alkenes, respectively:
(A)E, Z, E
(B)Z, E, Z
(C)Z, Z, E
(D)E, E, Z
(E)Z, Z, Z

答案：登入後查看
統計： A(0), B(3), C(2), D(0), E(2) #2275874

其他試題

24.Calculate the hydronium ion concentration of pure water at 25℃. (A)1.0×10-6M (B)1.0×10-4M (C)1.0×10-7M (D)1.0×10-14M (E)1.0×10-8M

25. Calculate the hydronium ion concentration in 0.200M aqueous NaOH (A)0.020M (B)1.0 ×10-14M (C)5.0 ×10-14M (D)0.1M (E)1.0 ×10-7M

26. Which of the followings are Lewis acids?(A)(1), (2) (B)(2), (4), (5) (C)(1), (4), (5) (D)(4), (5), (6) (E)(3), (4), (5)

27. Which of the follwing compounds can exist as pairs of cis-trans isomers? (1)CH3CH＝CH2 (2)(CH3)2C＝CHCH3 (3)CH3CH2CH＝CHCH3 (4)(CH3)2C＝C(CH3)CH2CH3 (5)ClCH＝CHCl (6)BrCH＝CHCl (A)3, 5, 6 (B)2, 3, 6 (C)3, 4, 5 (D)1, 2, 4 (E)2, 5, 6

29. How many alkene products, including E,Z isomers, might be obtained by dehydration of 3-methyl-3-hexanol with aqueous sulfuric acid?(A)6 (B)5 (C)4 (D)3 (E)2

30. What product would you obtain from catalytic hydrogenation of this alkene,(CH3)2C＝CHCH2CH3? (A)1-methylpentane (B)2-methylpentane (C)4-methylpentane (D)1,2-dimethylpentane (E)3-methylpentane

31. Which of these compounds are chiral?(A)(2) (B)(1) (C)3 (D)1, 2 (E)1, 3

32. Assign R, S configurations to these molecules, respectively: (A)R, S, S (B)S, S, S (C)R, R, R (D)R, R, S (E)S, S, R

33. Which of these substances have a meso form, respectively? (1)2, 3-Dibromobutane,(2)2, 3-Dibromopentane, (3)2, 4-Dibromopentane. (A)1, 2 (B)1, 3 (C)2 (D)2, 3

34. Which reagent in the following compounds is more nucleophilic? (A)(CH3)2N- (B)(CH3)2NH (C)(CH3)3B (D)(CH3)3N (E)CH3NH2

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