IUPAC name of `[Pt(NH_(3))_(2)Cl(NO_(2))]` is

Options

A. platinum diaminechloronitrite
B. chloronitrito-N-ammineplatinum (II)
C. diamminechloridonitrito-N-platinum (II)
D. diamminechloronitrito-N-platinate (II)

Answer

To determine the IUPAC name of the coordination compound \([Pt(NH_3)_2Cl(NO_2)]\), we will follow a systematic approach:

### Step 1: Determine the Oxidation State of Platinum
Let the oxidation state of platinum (Pt) be \(x\).
- Ammonia (\(NH_3\)) is a neutral ligand, so it contributes 0 to the charge.
- Chlorine (\(Cl\)) in this complex is a negatively charged ligand with a charge of -1.
- The nitrito ligand (\(NO_2\)) is also negatively charged with a charge of -1.

The overall charge of the complex is neutral (0). Therefore, we can set up the equation:
\[ x + 2(0) + (-1) + (-1) = 0 \]
This simplifies to:
\[ x - 2 = 0 \implies x = +2 \]
Thus, the oxidation state of platinum is +2.

### Step 2: Identify the Ligands and Their Names
The ligands in the complex are:
- Two ammonia (\(NH_3\)) ligands, which are named "ammine".
- One chlorine (\(Cl\)) ligand, which is named "chloro".
- One nitrito (\(NO_2\)) ligand, which is named "nitrito". Since it is bonded through the nitrogen atom, we specify it as "nitrito-N".

### Step 3: Arrange the Ligands Alphabetically
When naming coordination compounds, ligands are named in alphabetical order, regardless of the number of each type of ligand present:
1. Chloro (C)
2. Diamine (D for two ammine)
3. Nitrito-N (N)

Thus, the order will be:
- Chloro
- Diamine
- Nitrito-N

### Step 4: Combine the Ligands with the Metal Name and Oxidation State
The name of the metal (platinum) is followed by its oxidation state in Roman numerals in parentheses. Since the oxidation state of platinum is +2, we write it as (II).

### Final IUPAC Name
Putting it all together, the IUPAC name of the complex \([Pt(NH_3)_2Cl(NO_2)]\) is:
\[ \text{diaminochloridonitrito-Nplatinum(II)} \]

### Summary of the IUPAC Name
The final IUPAC name is:
**Diaminodichloridonitrito-Nplatinum(II)**