Which of the following is not a Lewis base?

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(D) Lewis base is defined as a substance that can donate a lone pair of electrons.$NH_3$ has a lone pair on the nitrogen atom,$O_2^-$ has lone pairs o

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$I^+$

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(D) Lewis base is defined as a substance that can donate a lone pair of electrons.$NH_3$ has a lone pair on the nitrogen atom,$O_2^-$ has lone pairs of electrons,and $H_2O$ has two lone pairs on the oxygen atom. All of these can act as Lewis bases.$I^+$ is a positively charged species (an electrophile) that lacks electrons and acts as a Lewis acid,not a Lewis base.

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