IUPAC name of $[Pt(NH_{3})_{2}Cl(NO_{2})]$ is:

Question

Accepted Answer

The IUPAC name of the complex $[Pt(NH_{3})_{2}Cl(NO_{2})]$ is "Diammine chlorido nitrito-N-platinum (II)." Let's break down the reasoning behind this naming and why Option 3 is correct:

1. **Ligands Naming:**
   - The ligands in the complex are NH₃, Cl, and NO₂. 
   - NH₃ is a neutral ligand and is named "ammine."
   - Cl⁻ is a negatively charged ligand and is named "chlorido."
   - NO₂⁻ can bind through nitrogen or oxygen. When it binds through nitrogen, it is named "nitrito-N."

2. **Order of Ligands:**
   - In IUPAC naming, ligands are listed in alphabetical order, regardless of charge. 
   - Therefore, "ammine" comes first, followed by "chlorido," and then "nitrito-N."

3. **Metal Naming:**
   - The central metal is platinum. Since the complex is neutral, the oxidation state of platinum is determined by the charges of the ligands.
   - NH₃ is neutral, Cl⁻ is -1, and NO₂⁻ is -1. Therefore, the oxidation state of platinum is +2, indicated by (II) in the name.

4. **Correct Option Justification:**
   - Option 3, "Diammine chlorido nitrito-N-platinum (II)," correctly follows the IUPAC naming conventions by listing the ligands in alphabetical order and specifying the oxidation state of the metal.

5. **Why Other Options are Incorrect:**
   - **Option 1: "Platinum diammine chloro-nitrite"** - This option does not follow the alphabetical order of ligands and does not specify the oxidation state of platinum.
   - **Option 2: "Chloronitrito-N-ammine platinum (II)"** - This option incorrectly orders the ligands, placing "chloronitrito-N" before "ammine."
   - **Option 4: "Diammine chlorido nitrito-N-platinate (II)"** - The term "platinate" is used for anionic complexes, but this complex is neutral, so "platinum" should be used instead.

In conclusion, Option 3 is the correct IUPAC name for the complex $[Pt(NH_{3})_{2}Cl(NO_{2})]$ because it adheres to the proper naming conventions, including the correct order of ligands and the indication of the metal's oxidation state.