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Which molecule is not a Lewis base? Options include H⁻, NH₃, H₂O, H₃C⁻, and BH₃, with BH₃ selected as the answer.

Multiple choice question asking which molecule is not a Lewis base, with options A) H⁻, B) NH₃, C) H₂O, D) H₃C⁻, E) BH₃, and E) BH₃ highlighted.

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