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27. Which of the following is a Lewis acid?
(A)BBr₃
(B) CCl₄
(C) NH₃
(D) CHBr₃

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統計： 尚無統計資料

其他試題

23. What is the type of intermolecular force for dissolving NaCl in H2O? (A)dispersion(B) dipole-dipole(C) hydrogen bonding(D) ion-dipole

24. What is the type of intermolecular force for dissolving Br2 in H2O? (A)dispersion(B) dipole-dipole(C) hydrogen bonding(D) induced dipole

25. Which of the following acids will have the strongest conjugate base? (A)HCl(B) HClO4(C) HNO3(D) HCN

26. Which one of the following salts, when dissolved in water, produces the solution with the lowest pH? (A)NaCl(B) KCl(C) MgCl2(D) AlCl3

28. Which of the following is a Lewis base? (A)AlF3(B) H2O(C) SiF4(D)

29. Which are acid-base reactions according to Lewis theory but not according to the Brønsted-Lowry theory?(A) I, II (B) III, IV (C) I, III, IV (D) I, II, III, IV

30. Which acid is the most acidic?(A)I (B) II (C) III (D) IV

31. Which is the IUPAC name for the following cycloalkane? (A) 2,4-dimethyl-1-ethylcyclopentane(B) 1,3-dimethyl-5-ethylcyclopentane (C) 1-ethyl-2,4-dimethylcyclopentane(D) 1-ethyl-3,5-dimethylcyclopentane

32. Which conformation of pentane is most stable?(A) I(B) II(C) III(D) IV

33. Which of these diaxial conformations has the highest energy? (A) I(B) II(C) III(D) IV

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