Which of the following species acts as a Bronsted base but not as an acid?

{C H}_{3} C O O H

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H {C O}_{3}^{-}

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H_{2} {P O}_{2}^{-}

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H_{2} {P O}_{3}^{-}

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Solution

The correct option is A ${C H}_{3} C O O H$
Option C is correct and the reaction is-
$H_{2} {P O}_{2}^{2 -} + H^{+} \to H_{3} P O_{2}$
According to Bronsted- Lowry, base is a substance capable of accepting a hydrogen ion.

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