Question

The IUPAC name of the following complex is \([Co(NH_2CH_2CH_2NH_2)_2Br_2]Br\)

• A. Bis (ethane-1, 2-diamine) dibromo cobalt (III) bromide
• B. Di (ethane-1, 2-diamine) dibromo cobalt (III) bromide
• C. Tribromo bis (ethane-1, 2-diamine) cobalt (III)
• D. Dibromo bis (ethylenediamine) cobalt (III) bromide

Hint:

In naming coordination complexes, follow: ligands (alphabetical) → metal (with oxidation state) → counter ion (if present).

Answer 1

The Correct Option is D

In the complex \([Co(en)_2Br_2]Br\), where \(en = ethylenediamine = NH_2CH_2CH_2NH_2\), the ligands are: - 2 bidentate ethylenediamine ligands - 2 bromide ligands Since the coordination number is 6, cobalt is in +3 oxidation state. The naming order: - Neutral ligands (ethylenediamine) - Anionic ligands (bromide) - Metal name with oxidation state Hence, the correct IUPAC name is: \[ \text{Dibromo bis (ethylenediamine) cobalt (III) bromide} \]