What is the correct IUPAC nomenclature for the coordination compound [Cr(NH3)4Cl2]Cl?
Answer and explanation
Correct answer: B. Tetraamminedichloridochromium(III) chloride
- Step 1: In naming coordination entities, ligands are listed in alphabetical order before the central metal atom regardless of charge: 'ammine' (for ) precedes 'dichlorido' (for ).
- Step 2: The oxidation state of chromium is calculated: , designated in Roman numerals as (III).
- Step 3: Since the coordination sphere is cationic (), the metal retains its standard name 'chromium', followed by the counterion 'chloride'.
Answer
Tetraamminedichloridochromium(III) chloride
Why not the others: 'Dichloridotetraamminechromium(III) chloride' violates alphabetical ligand ordering ('ammine' must precede 'chlorido'); 'Tetraamminechromium(III) trichloride' fails to indicate the coordinated chlorido ligands; 'Dichlorotetraamminechromate(III) chloride' mistakenly uses the anionic metal suffix '-ate' for a cationic complex.
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