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Among boron trifluoride, stannic chloride and stannous chloride, Lewis acid is represented by:

1. only stannic chloride
2. boron trifluoride and stannic chloride
3. boron trifluoride and stannous chloride
4. only boron trifluoride

Correct answer: boron trifluoride and stannic chloride

Solution

Boron trifluoride (BF3) and stannic chloride (SnCl4) are Lewis acids because they can accept electron pairs. BF3 has an incomplete octet, and SnCl4 has an empty d-orbital for electron pair acceptance.

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