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. Diamminechloridomethanamine platinium(II)chloride
C. Diamminechloridoaminomethyl platinium (II) chloride
D. Chloridobis (ammine ) methylamineplatinium (II) chloride

Answer

To determine the correct IUPAC name of the complex \([Pt(NH_3)_2Cl(CH_3NH_2)]Cl\), we will follow the systematic naming rules for coordination compounds. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the Ligands
The complex contains the following ligands:
- Two ammonia molecules \((NH_3)\)
- One chloride ion \((Cl^-)\)
- One methylamine molecule \((CH_3NH_2)\)

### Step 2: Name the Ligands Alphabetically
When naming the ligands, we list them in alphabetical order, regardless of the number of each type of ligand:
- Ammonia is named as "ammine".
- Chloride is named as "chlorido".
- Methylamine is named as "methylamine".

### Step 3: Indicate the Number of Each Ligand
Since there are two ammonia ligands, we use the prefix "di" for it. The other ligands (chlorido and methylamine) are present in one quantity each, so we do not need to use any prefix for them:
- Ammonia (2) → "diammine"
- Chloride (1) → "chlorido"
- Methylamine (1) → "methylamine"

### Step 4: Combine the Ligand Names
Now we combine the names of the ligands in alphabetical order:
- The alphabetical order is: "ammine", "chlorido", "methylamine".
- Therefore, the combined name is: "diammine chlorido methylamine".

### Step 5: Name the Metal
The metal in the complex is platinum (Pt). Since the overall charge of the complex is positive, we will use the suffix "ium" for the metal:
- Platinum → "platinum".

### Step 6: Determine the Oxidation State of the Metal
To find the oxidation state of platinum in this complex:
- Ammonia (NH3) is a neutral ligand (0 charge).
- Methylamine (CH3NH2) is also a neutral ligand (0 charge).
- Chlorido (Cl) has a -1 charge.
- The overall charge of the complex is +1 (due to the additional chloride ion outside the coordination sphere).

Let \(x\) be the oxidation state of platinum:
\[ x + 2(0) + (-1) = +1 \implies x - 1 = +1 \implies x = +2 \]
Thus, the oxidation state of platinum is +2.

### Step 7: Combine All Parts
Now, we can combine all parts to write the full IUPAC name:
- The full name is: **diammine chlorido methylamine platinum(II) chloride**.

### Final Answer
The correct IUPAC name of the complex \([Pt(NH_3)_2Cl(CH_3NH_2)]Cl\) is:
**diammine chlorido methylamine platinum(II) chloride**.

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