Question

The correct IUPAC name for the compound $\left[Co{\left(N{H}_3\right)}_{4}CI(ONO)\right]Cl$ is:

• A. tetraamminechloridonitrito-N-cobalt (III) chloride
• B. chloridonitrito- O-tetraamminecobalt (II) chloride
• C. dichloridonitrito- O-tetraamminecobalt (III)
• D. tetraamminechloridonitrito-O-cobalt (III) chloride

Answer 1

Answer: (D)

In ${\left[Co{\left(N{H}_3\right)}_{4}Cl(ONO)\right]}^{+}C{l}^{-}$, cobalt is in $+3$ oxidation state and the complex is cationic. ONO ligand attach to metal ion through $O$ atom; so $-O-$ is used while naming as nitrito before the name of metal ion. So IUPAC name given in option (D) is correct