iupac nomenclature

Question

What is the correct IUPAC name of [Cr(NH3)4Cl2]Cl?

RankGuru · Accepted Answer

1. **Oxidation State Determination**: Let $x$ be the oxidation state of $Cr$. Ammonia ($NH_3$) is neutral ($0$), and Chlorine ($Cl$) is $-1$.
   - $x + 4(0) + 2(-1) = +1$ (due to the external $Cl^-$ ion).
   - $x - 2 = +1 \implies x = +3$. The metal is Chromium(III).
2. **Naming Ligands**: 
   - $4$ Ammonia molecules $	o$ **tetraammine** (alphabetically first).
   - $2$ Chlorine molecules within the sphere $	o$ **dichloro**.
3. **Metal Name**: Since the complex cation is positive, we use the standard name **chromium**.
4. **Counter Ion**: The external $Cl^-$ is named **chloride**.
5. **Final Name**: **Tetraamminedichlorochromium(III) chloride**.

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