Correct IUPAC name of ` [ Pt ( N H _ 3 ) _ 2 ) Cl ( CH _ 3 NH _ 2 ) ]Cl ` is :

Options

A. Bis (ammine )chloride (methylamine ) paltinium (II) chloride
B. Diamminechlorido ( methylamine ) platinium (II) chloride
C. Diamminechlorido ( aminomethyl ) platinium (II) chloride
D. Chloridobis (ammine ) methylamineplatinium (II) chloride

Answer

To determine the correct IUPAC name of the coordination compound \([Pt(NH_3)_2Cl(CH_3NH_2)]Cl\), we will follow these steps:

### Step 1: Identify the central metal atom and its oxidation state.
- The central metal atom in this compound is platinum (Pt).
- To find the oxidation state of platinum, we set it as \(x\). The ligands are:
- Ammonia (NH₃) is a neutral ligand (0 charge).
- Chloride (Cl) has a charge of -1.
- Methylamine (CH₃NH₂) is also a neutral ligand (0 charge).
- The counter ion is chloride (Cl⁻), which has a charge of -1.

Setting up the equation based on the charges:
\[ x + 2(0) + (-1) + 0 + (-1) = 0 \]
This simplifies to:
\[ x - 2 = 0 \implies x = +2 \]
Thus, the oxidation state of platinum is +2.

### Step 2: Identify and name the ligands.
- The ligands present are:
- Two ammonia molecules (NH₃), which are named as "ammine".
- One chloride ion (Cl), which is named as "chlorido".
- One methylamine (CH₃NH₂), which is named as "methylamine".

### Step 3: Arrange the ligands in alphabetical order.
- According to IUPAC naming conventions, ligands are listed in alphabetical order regardless of their prefixes (di-, tri-, etc.).
- The order will be:
1. Chlorido (from Cl)
2. Methylamine (from CH₃NH₂)
3. Diamine (from two NH₃)

### Step 4: Combine the names of the ligands with the central metal.
- The name of the complex ion will be:
- "diammine" for two NH₃
- "chlorido" for Cl
- "methylamine" for CH₃NH₂
- Therefore, the name of the coordination complex is:
- "diammine chlorido methylamine platinum".

### Step 5: Indicate the oxidation state of the metal.
- The oxidation state of platinum (+2) is indicated in Roman numerals in parentheses after the metal name.
- Thus, we write it as "platinum(II)".

### Step 6: Name the counter ion.
- The counter ion is chloride (Cl⁻), which is simply named "chloride".

### Final IUPAC Name:
Putting it all together, the correct IUPAC name of the compound \([Pt(NH_3)_2Cl(CH_3NH_2)]Cl\) is:
**Diammine chlorido methylamine platinum(II) chloride.**

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