Which of the following is a pi-acceptor ligand?
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This SSC CGL Chemistry question asks: “Which of the following is a pi-acceptor ligand?” The correct answer is CO. CO is a pi-acceptor ligand (pi-back bonding). Option A (“NH3”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question. Option D (“H2O”) is incorrect because it does not satisfy the chemical formula, reaction, periodic trend, numerical relation, oxidation state or definition required by the question.