Question

IUPAC name of [Co(NH$_3$)$_4$(H$_2$O)Cl]Cl$_2$ is:

• A. Tetraammineaquachlorocobalt (III) dichloride
• B. Tetraamminechloroaquacobalt (III) chloride
• C. Tetraammineaquachlorocobalt (III) chloride
• D. Aquachlorotetraamminecobalt (III) chloride

Hint:

Follow alphabetical order for ligands and include oxidation state of the central metal in Roman numerals. Counter ions go at the end.

Answer 1

The Correct Option is C

The central metal is cobalt (Co), oxidation state +3. Ligands are named alphabetically: ammine before aqua, then chloro. Counterions (Cl$^-$) are named last. So the correct order gives Tetraammineaquachlorocobalt (III) chloride.