Which of the following is a Lewis base?

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(D) Lewis base is defined as a substance that can donate a lone pair of electrons to form a coordinate covalent bond.$NH_3$ (ammonia) has a nitrogen a

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$NH_3$

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(D) Lewis base is defined as a substance that can donate a lone pair of electrons to form a coordinate covalent bond.$NH_3$ (ammonia) has a nitrogen atom with one lone pair of electrons,which it can donate.$BF_3$,$Cu^{2+}$,and $AlCl_3$ are all electron-deficient species or cations that act as Lewis acids by accepting electron pairs.

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