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JEE MainChemistryCoordination Compounds

Which of the following complexes is both diamagnetic and optically active?

Options

  1. Atrans - [Co(en)₂Cl₂]^+
  2. B[Ni(en)₃]²⁺
  3. C[Co(en)₃]³⁺
  4. Dcis - [Ni(en)₂Cl₂]

Correct answer

C. [Co(en)₃]³⁺

Step-by-step solution

To find a complex that is both diamagnetic and optically active, we must evaluate both the magnetic properties and the stereochemistry of each option. For magnetic properties, Co is in +3 state in both Co complexes. Co³⁺ has a 3d^6 configuration. Ethylenediamine (en) is a strong field ligand, which causes pairing of electrons in the t_ 2g orbitals ( t_ 2g ^6 e_g^0 ). Thus, both [Co(en)₃]³⁺ and trans - [Co(en)₂Cl₂]^+ are diamagnetic. Ni is in +2 state in both Ni complexes. Ni²⁺ has a 3d^8 configuration. In an octahe

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