Question

Iupac name of [CoCl2(NH3)4]Cl

Answer 1

tetraamminedi-chloro cobalt(III)

Answer 2

Answer : The IUPAC name of $[CoCl_2(NH_3)_4]Cl$ is, tetraamminedichloridocobalt(III)chloride

Explanation :

Rules for naming of the coordination compounds :

• The ligand named first then metal.
• The charge of metal indicated with the Roman numerals and enclosed in the parenthesis after metal name.
• The ligands are named in alphabetical order before the metal ion.
• Ligands that include a numerical prefix in the name use the prefixes bis for 2, tris for 3, or tetrakis for 4 to indicate their number.
• If the complex ion is an anion, we drop the ending of the metal name and add –ate.

In the given coordination compound, Co is the cobalt metal, Cl and $NH_3$ are the ligands named as chloro and ammine. The oxidation state of Co is (+3).

Hence, the IUPAC name of $[CoCl_2(NH_3)_4]Cl$ is, tetraamminedichloridocobalt(III)chloride