The correct IUPAC name of the complex \( [\text{Pt}(\text{NH}_3)_2\text{Cl}_2] \) is :
Show Hint
- diamminedichloridoplatinum (IV)
- diamminedichloridoplatinum (II)
- dichloridodiammineplatinum (IV)
- dichloridodiammineplatinum (II)
The Correct Option is B
Solution and Explanation
• Ligands are named first in alphabetical order.
• Use prefixes like di, tri, etc., to indicate the number of ligands.
• The name of the metal is followed by its oxidation state in Roman numerals in parentheses.
• For neutral complexes, the metal name remains unchanged (Platinum).
Step 1: Determining the oxidation state of Platinum.
Let the oxidation state of Pt be \(x\). Ligands:
• Ammine (\(\text{NH}_3\)) is neutral (charge = \(0\)).
• Chlorido (Cl) has a charge of \(-1\).
The complex is neutral, so the sum of charges is zero: \[ x + 2(0) + 2(-1) = 0 \quad \Rightarrow \quad x - 2 = 0 \quad \Rightarrow \quad x = +2 \] The oxidation state is (II).
Step 2: Naming the ligands in alphabetical order.
• Ammine (starts with 'a')
• Chlorido (starts with 'c')
Alphabetically, ammine comes before chlorido. Since there are two of each, we use "diammine" and "dichlorido".
Step 3: Combining the name.
Ligands: diammine + dichlorido Metal: platinum Oxidation state: (II) Full Name: diamminedichloridoplatinum (II)
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