Which one of the following contains all Lewis acids?
- A. AlCl_3, Co^{3+}, BF_3 ✓
- B. BCl_3, NH_3, OH^-
- C. Mg^{2+}, H_2O, F^-
- D. BF_3, NH_3, H_2O
Correct Answer: A. AlCl_3, Co^{3+}, BF_3
Explanation
Lewis acids are electron-pair acceptors. AlCl_3, Co^{3+}, and BF_3 are all capable of accepting an electron pair.
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