MHT CET Medical202626 April 2026Morning ShiftChemistryCoordination CompoundsActual
The IUPAC name of [ CoCl(NH ₃)₅] Cl ₂ is:
Options
- APentaamminechlorocobalt(III) chloride
- BPentaamminecobalt(III) chloride
- CPentaamminechlorocobalt(II) chloride
- DChloropentaamminecobalt(III) dichloride
Correct answer
A. Pentaamminechlorocobalt(III) chloride
Step-by-step solution
The given complex is [ CoCl(NH ₃)₅] Cl ₂ . The coordination sphere is the cation [ CoCl(NH ₃)₅]²⁺ and the counter ion is the chloride anion Cl ^- . Let the oxidation state of cobalt be x . x + (-1) + 5(0) = +2 x = +3 The ligands present in the coordination sphere are ammine ( NH ₃ ) and chloro ( Cl ^- ). According to alphabetical order, ammine is written before chloro. Since there are five ammine ligands and one chloro ligand, the prefix is pentaamminechloro. The central metal is in a cationic complex, so it is nam