Question

The IUPAC name of the following complex [Cr(H\(_2\)O)\(_3\)(NH\(_3\))\(_3\)]Cl\(_3\) is

• A. Triaminetriquachromium(III) chloride
• B. Triaquatriaminemechromium(III) chloride
• C. Triaquatriaminemechromium(II) chloride
• D. Triaminetriquachromium(II) chloride
• E. Triaquatriaminemechromium(III) trichloride

Hint:

Remember to use proper prefixes (di, tri, tetra) and list ligands alphabetically by their root name (e.g., 'ammine' before 'aqua').

Answer 1

The Correct Option is A

Step 1:
\[ \text{Complex: } [\text{Cr}(\text{H}_2\text{O})_3(\text{NH}_3)_3]\text{Cl}_3 \]

Step 2:
\[ \text{Ligands: NH}_3 \rightarrow \text{ammine}, \quad \text{H}_2\text{O} \rightarrow \text{aqua} \] \[ \text{Alphabetical order: ammine before aqua} \] \[ \Rightarrow \text{Triammine + Triaqua} \]

Step 3:
\[ \text{Let oxidation state of Cr = x} \] \[ x + 0 + 0 = +3 \Rightarrow x = +3 \]

Step 4:
\[ \text{Name: Triamminetriaquachromium(III) chloride} \]

Step 5:
\[ \text{Matching given options: Triaminetriquachromium(III) chloride} \] Final Answer:
\[ Option (A) \]