Which of the following coordination complexes forms an inner orbital complex?

Step-by-step solution

To determine whether a complex is inner or outer orbital, we examine the oxidation state, d -electron count, and ligand field strength: In [ Mn ( CN )₆]³⁻ , Mn is in the +3 oxidation state with a 3d⁴ configuration. Since CN ⁻ is a strong field ligand, it forces electron pairing. The electrons occupy the t_ 2g orbitals, leaving two 3d orbitals empty. It undergoes d²sp³ hybridization, forming an inner orbital complex. In [ Ni ( NH ₃)₆]²⁺ , Ni is in the +2 oxidation state with a 3d⁸ configuration. An octahedral d⁸ ion