Which of the following behaves as both Lewis and Bronsted base

B F_{3}

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C l^{-}

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C O

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H C O_{3}^{-}

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Solution

The correct option is D $H C O_{3}^{-}$
Those substances that accept protons are called Bronsted base and those that donate that protons are called Bronsted acid.
from given option, only $H C O_{3}^{-}$ can behave as both Lewis and Bronsted base
$H C O_{3}^{-} + H^{+} ⇌ H_{2} C O_{3}$ Bronsted base
$H C O_{3}^{-} ⇌ H^{+} + C O_{3}^{2 -}$ Bronsted acid

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