Which of the following complexes has the smallest d-orbital splitting energy? A)Co(NH₃)₆³⁺ B)Co(NH₃)₅OH²⁺ C)Co(NH₃)₅CN²⁺ D)Co(NH₃)₅I²⁺ E)Co(NH₃)₅(OH₂)³⁺

Question

Quizplus · Accepted Answer

In octahedral complexes, the d-orbital splitting energy depends on the nature of the ligands and their field strength. The ligand field strength is determined by the charge on the ligand and its electronegativity. Among the given complexes, the ligand that exerts the weakest field is I–(iodide ion) because it is the largest anion with the least electronegative element. Hence, Co(NH3)6I2+ has the smallest d-orbital splitting energy.

Which of the Following Complexes Has the Smallest D-Orbital Splitting