Question

IUPAC name of the compound [Cr(H\(_2\)O)\(_3\)(NH\(_3\))\(_3\)]Cl\(_3\)

• A. Chromium(III) ammine aqua chloride
• B. Chromium(III) ammine chloride aqua
• C. Chromium(III) hexaaquachloride
• D. Chromium(III) hexaamminetrichloride

Hint:

When naming coordination compounds, remember the order of ligands, oxidation states, and how to denote them in the correct IUPAC form. "Aqua" and "ammine" come before the counter ions, which are written at the end.

Answer 1

The Correct Option is A

To determine the IUPAC name of the compound, we need to follow the naming rules for coordination compounds. In this compound, we have: - Cr as the central metal ion, with an oxidation state of +3, indicated by the ligands and the charge balance. - The ligands are: - H\(_2\)O (water), which is called "aqua", - NH\(_3\) (ammonia), which is called "ammine". - The complex is chloride-terminated, indicated by the Cl\(_3\) outside the coordination sphere. The IUPAC name is Chromium(III) ammine aqua chloride, reflecting the coordination of ammine and aqua ligands to chromium, with the chloride as a counter ion.