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Which equilibrium can be described as Lewis acid-base reaction but not Bronsted acid-base reaction?

(a) H2O + CH3COOHH3O+ + CH3COO-

(b) 2NH3 + H2SO4 2NH4+ + SO42-

(c) NH3 + CH3COOH NH4+ + CH3COO-

(d) [Cu(H2O)4]2+ + 4NH3  [Cu(NH3)4]2+ + 4H2O