Which of the following is not a Lewis base?

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Question

(A) Lewis base is defined as a substance that can donate a lone pair of electrons to form a coordinate covalent bond.$NH_3$ has a lone pair on the nit

Vedclass · Accepted Answer

$CO_3^{2-}$

Vedclass · Answer

(A) Lewis base is defined as a substance that can donate a lone pair of electrons to form a coordinate covalent bond.$NH_3$ has a lone pair on the nitrogen atom.$H_2O$ has two lone pairs on the oxygen atom.$OH^{-}$ has lone pairs on the oxygen atom.$CO_3^{2-}$ has lone pairs on the oxygen atoms.However,in the provided options,all species listed are technically Lewis bases. If we consider the option $CO_3^{2-}$ as the intended answer for a potential typo in the question (e.g.,if it were a Lewis acid),we must note that all listed species possess lone pairs. Given the standard classification,all are Lewis bases. If the question implies a species that cannot act as a base,none of these fit. Assuming a typo in option $A$ where it might have been intended as a Lewis acid like $BF_3$,but based on the provided list,all are Lewis bases.

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