Which of the following behaves as both Lewis and Bronsted base
Correct option is D. $$HCO_3^{-}$$
- Those substances that accept protons are called Bronsted base and those that donate that protons are called Bronsted acid.
from given option, only $$HCO_3^-$$ can behave as both Lewis and Bronsted base
$$HCO_3^{−}+H^+\rightleftharpoons H_2CO_3$$ Bronsted base
$$HCO^{−}_3\rightleftharpoons H^++CO^{2−}_3$$ Bronsted acid