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Which of the following is least likely to behave as Lewis acid?

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Which of the following is least likely to behave as Lewis acid?
A. `NH_3`
B. `BF_3`
C. `OH^-`
D. `H_2O`
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Correct Answer - B
`BF_3` is an electron deficient species, thus behaves like a Lewis acid.
`because` Bond order =`(N_b-N_a)/2`
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