The correct name for the complex ion [CoCl(ONO)(en)2]+ is : — Coordination Compounds Chemistry Question

💡 Solution & Explanation

Step 1: Identify the ligands: one chlorido/chloro (Cl^-), one nitrito-O (ONO^-), and two ethylenediamine (en, a bidentate ligand, hence using the prefix 'bis'). Step 2: Order the ligands alphabetically: chloro, then ethylenediamine, then nitrito-O, giving 'chlorobis(ethylenediamine)nitrito-O'. The central metal keeps its normal name 'cobalt' because the complex is a cation. Step 3: Calculate the oxidation state of Co: x - 1 - 1 + 2*(0) = +1 => x = +3. This results in the IUPAC name: chlorobis(ethylenediamine)nitrito-O-cobalt (III) ion, matching option (d).