Write the IUPAC name for the coordination compound:
$[Cr(NH_3)_3(H_2O)_3]Cl_3$
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → triamminetriaquachromium (III) chloride
1. Ligands: ''ammine'' $(NH_3)$ and ''aqua'' $(H_2O)$. Both are neutral.
2. Count & Alphabetize: 3 ammine, 3 aqua. ''ammine'' comes before ''aqua''. ⇒ triammine, triaqua.
3. Metal: Chromium (Cr).
4. Oxidation State: $\text{NH}_3(0)+\text{H}_2\text{O}(0)+\text{Cr}(x)=+3$ (due to $\text{3Cl}^{-}$ counterions) ⇒ x=+3 (Chromium(III)).
5. Counter-ion: Chloride.
Final Name: triammine-triaqua-chromium(III) chloride.