First slide

IUPAC Nomenclature

Question

IUPAC name of the complex, $K_{3} [Fe {(CN)}_{6}]$ is

Moderate

A

Potassium hexacyanido ferrate(III)
B

tripotassium hexacyanido ferrate(III)
C

Potassium hexacyanido ferrate(II)
D

Potassium hexacyanato ferrate(II)

Solution

${CN}^{-}$ …cyanido or cyano(preferably cyanido)…uninegative ligand ;
Oxidation state of iron is “+3” ;
Counter ion is potassium ion and while naming the counter ion prefixes like di, tri…should not be used;
Complex ion is an anion, it should be written after name of cation;
While naming the complex, ligands are named first (in alphabetical order with proper prefixes) followed by metal ion with its oxidation state as roman number in parenthesis;
While naming the metal ion of an anionic complex the suffix “ate” is used;

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