Question

IUPAC name of $[Pt{(N{H_3})_3}Br(N{O_2})Cl]Cl$
 (A) Triamminechlorobromonitroplatinum $(IV)$ chloride
(B) Triamminebromonitrochloroplatinum $(IV)$ chloride
(C) Triamminebromochloronitroplatinum $(IV)$ chloride
(D) Triamminenitrochlorobromoplatinum $(III)$ chloride

Answer 1

Hint: In order to solve this question, we should first understand the set of instructions devised by the IUPAC to name the organic molecules. The term IUPAC stands for International Union of Pure and Applied Chemistry. It consists of some rules for the nomenclature of organic compounds which are even modified later on for the uniform naming of organic compounds. It has laid down a set of rules which help in the naming of all the organic compounds. This is important for the uniform nomenclature of the organic compounds.

Complete Step by Step Solution:
In the naming of complex coordination complexes, the ligands are usually written before the central metal. Whenever there is more than one polydentate ligand attached to the central metal ion, the prefixes are as follows: bis-, tris-, etc. The names of the anions that are present in a coordination compound should end with the letter ‘o’, which usually replaces the letter ‘e’. Thus, the sulphate anion should be written as ‘sulfato’ and the chloride anion should be written as ‘chlorido’.

The below neutral ligands are assigned special names in coordination compounds as follows: NH₃ (ammine), H₂O (aqua or aquo), CO (carbonyl), NO (nitrosyl). We should follow alphabetical order while naming the organic compound. The oxidation number of the metal in the given compound is$ + 4$. So, the IUPAC name of $[Pt{(N{H_3})_3}Br(N{O_2})Cl]Cl$ is triamminebromochloronitroplatinum $(IV)$ chloride.
Therefore, the correct answer is option C.

Note: When the coordination centre is attached to more than a single ligand, the names of the ligands should be written in an alphabetical order which is not affected by the numerical prefixes that should be applied to the ligands. Whenever there is more than one monodentate ligand present in the coordination compound, the prefixes that give information into the number of ligands are as follows: di-, tri-, tetra-, etc.