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In the name 'tris(ethane-1,2-diamine)cobalt(III) sulphate' for [Co(en)₃]₂(SO₄)₃, why is 'tris' used instead of 'tri'?
ABecause there are 3 sulphate ions
BBecause the ligand name 'ethane-1,2-diamine' itself contains numerical prefixes ('di-')
CTris is just decorative
DBecause cobalt is in +3 oxidation state
Answer & Solution
Correct answer: B. Because the ligand name 'ethane-1,2-diamine' itself contains numerical prefixes ('di-')
When the ligand name itself contains numerical prefixes (di-, tri-, tetra-), the multiplier becomes **bis-, tris-, tetrakis-** to avoid ambiguity. Example: tris(ethane-1,2-diamine) — 3 'en' ligands.
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