Question

The IUPAC name of [Co(NH${}_3$)${}_6$]Cl${}_3$ is _____.

• A. hexamminechlorocobalt (III) .
• B. hexammoniumcobalt (III) chloride.
• C. hexaminecobalt (III) chloride.
• D. hexamminecobalt (III) chloride.
• E. chlorohexamminecobalt (III) .

Answer 1

The correct option is D hexamminecobalt (III) chloride.

Option (D) is correct.

The IUPAC name of $\left[Co\right(N{H}_3{)}_6]C{l}_3$ is hexamminecobalt (III) chloride.

In this complex, ammonia is a neutral ligand and $Cl$ has -1 charge. The oxidation state of cobalt in this complex is +3 so the word 'cobalt' is used and chloride ion is present outside the sphere so it will be named after naming the complex.