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NEET levelSingle correct optionDifficulty 1 of 3ie002

Which of the following behaves as a Lewis acid?

A $NH X_{3}$
B $BF X_{3}$
C $OH X^{-}$
D $Cl X^{-}$

Answer: B

A Lewis acid accepts an electron pair.

BF X_{3}

has an incomplete octet (6 electrons on B) and accepts a pair.

NH X_{3}

,

OH X^{-}

and

Cl X^{-}

all carry lone pairs and are Lewis bases.

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