Question

The IUPAC name of ferric ferrocyanide is:
A. $Hexacyanoferrate{\text{ }}\left( {II} \right)$
B. $Iron{\text{ }}\left( {II} \right){\text{ }}hexacyanoferrate{\text{ }}\left( {III} \right)$
C. $Iron{\text{ }}\left( {III} \right){\text{ }}hexacyanoferrate{\text{ }}\left( {III} \right)$
D. $Iron{\text{ }}\left( {II} \right){\text{ }}hexacyanoferrate{\text{ }}\left( {II} \right)$

Answer 1

Here, before solving this question, first we need to understand the meaning of IUPAC nomenclature. As we know that IUPAC nomenclature is written on the basis of naming the longest chain of molecules of carbons that are connected by single bonds. Here, the single bond can be a continuous chain or a ring.

Complete step by step answer:

With the help of IUPAC nomenclature, we know that either multiple atoms or bonds except carbon and hydrogen. This is indicated by some prefixes or suffixes based on the specific set of priorities.
To derive the IUPAC name of a compound we have to consider the following order:
The branched groups or the halogen atoms are arranged in alphabetical order.
The prefix will be the main part of the main chain.
Then, we will name the compound at the end with reference to the functional group and its position on the longest carbon chain.
Firstly, we know that the formula of $ferric{\text{ }}ferrocyanide$ is $F{e_4}{[Fe{(CN)_6}]_3}$
Here, the molecule contains $F{e^{3 + }}$ ions and ${[Fe{(CN)_6}]^{4 - }}$ ions. The negative ligand has IUPAC name of $hexacyanoferrate{\text{ }}\left( {II} \right)$.
So, the prefix will be: $F{e^{3 + }}$ Iron
Therefore, the IUPAC name is $Iron\left( {III} \right)hexacyanoferrate{\text{ }}\left( {II} \right)$
Therefore, the option C is correct.

Note:
The ferric ferrocyanide which we considered in the question is an iron-based inorganic colorant which is also known as Prussian blue. It is among the first synthetic pigments that is found to be safe coloring. It can be applied on cosmetics and personal products. Also, you can use the products around your eye area.