Question

The I.U.P.A.C name for ${\left[Fe{\left(CN\right)}_6\right]}^{3-}$ ion is :

• A. hexacyanidoferrate(II) ion
• B. hexacyanidoferrate(III) ion
• C. hexacyanideiron(II) ion
• D. iron(III) hexacyanide ion

Answer 1

The correct option is B hexacyanidoferrate(III) ion

Name the ligands first, in alphabetical order, then the metal atom or ion.

Number of ligands =6 $hexa$

Name of ligand = $Cyanido$ suffix (-ido) for negative ligand

Metal = $Feferrate$

Oxidation state $=x+(-6)=-3\Rightarrow x=+3$

The name of the ion is = $hexacyanidoferrate\left(III\right)$