In which of the following cases is water acting as a base under the Lewis definitions,but not under the Bronsted-Lowry definitions? A)H₂O(l)+ HF(g)⇌ H₃O⁺(aq)+ F^-(aq) B)H₂O(l)⁺ CN^-(aq)⇌ OH^-(aq)+ HCN(aq) C)2 H₂O(l)+ Cu²⁺(aq)⇌ Cu(H₂O)₂²⁺(aq) D)2 H₂O(l)+ PO₄^3-(aq)⇌ 2 OH^-(aq)+ H₂PO₄^-(aq) E)2 H₂O(l)[electrolysis] ⇌ 2 H₂(g)+ O₂(g)

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In option C, water acts as a Lewis base by donating a pair of electrons to the copper ion to form a complex ion, but it does not donate a proton, which is required for it to act as a Bronsted-Lowry base.

In Which of the Following Cases Is Water Acting as a Base