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Which of the following molecules acts as a Lewis acid?

1. (CH3)2O
2. (CH3)3P
3. (CH3)3N
4. (CH3)3B

Correct answer: (CH3)3B

Solution

A Lewis acid is a species that can accept a pair of electrons. (CH3)3B has an incomplete octet and can accept electrons, making it a Lewis acid.

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