Consider the following : I. AlCl_3 II. NH_3 III. BF_3 IV. FeCl_3 How many of the above are Lewis acids?
- A. One
- B. Two
- C. Three ✓
- D. All the four
Correct Answer: C. Three
Explanation
AlCl3, BF3, and FeCl3 are electron-deficient molecules or have empty d-orbitals, which allows them to act as electron-pair acceptors (Lewis acids). NH3 has a lone pair of electrons and acts as a Lewis base. Hence, three of them are Lewis acids.
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