Question

The IUPAC name of [Co(en)₂Cl₂]Cl is ______.

Options

• bis(ethylenediamine)dichloridocobalt(III) chloride

• dichloridobis(ethylenediamine)cobalt(III) chloride

• dichloridobis(ethylenediamine)cobalt(I) chloride

• trichloridobis(ethylenediamine)cobalt(0)

Answer 1

The IUPAC name of [Co(en)₂Cl₂]Cl is dichloridobis(ethylenediamine)cobalt(III) chloride.

Explanation:

The IUPAC name of [Co(en)₂Cl₂]Cl is dichloridobis(ethylenediamine)cobalt(III) chloride because:

• Co is in the +3 oxidation state, so it’s named cobalt(III).
• en (ethylenediamine) is a bidentate ligand, so we use bis(ethylenediamine).
• The two Cl⁻ ligands are named dichloro.
• The chloride ion outside the coordination sphere is named chloride.