What is the systematic IUPAC name for the coordination complex ?

Answer and explanation

Correct answer: A. Pentaamminechloridocobalt(III) chloride

  1. Step 1: Determine the oxidation state of the central cobalt ion: .
  2. Step 2: Name the ligands in alphabetical order with appropriate prefixes: ammine (5 ligands pentaammine), followed by chlorido (1 ligand chlorido).
  3. Step 3: Combine with the metal name, oxidation state in Roman numerals, and counter-ion: pentaamminechloridocobalt(III) chloride.
Answer
Pentaamminechloridocobalt(III) chloride.
Why not the others: Pentaamminechlorocobalt(III) dichloride uses obsolete 'chloro' instead of 'chlorido' and incorrectly includes 'di' for the counter-ion; Chloropentaamminecobalt(II) chloride has incorrect ligand alphabetical order and oxidation state ; Pentaamminechloridocobalt(II) chloride assigns incorrect oxidation state .

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