Question:

Which one of the following has an optical isomer?

Updated On: Jul 7, 2022
  • $[Zn(en)_2]^{2+}$
  • $[Zn(en)(NH_3)_2]^{2+}$
  • $[Co(en)_3]^{3+}$
  • $[Co(H_2O)_4(en)]^{3+}$
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The Correct Option is C

Solution and Explanation

Optical isomers rarely occur in square planar complexes due to the presence of axis of symmetry. Optical isomerism is common in octahedral complexes of the general formula, $\left[Ma_{2}b_{2}c_{2}\right]^{n\pm}, \left[Mabcdef\right],\left[M\left(AA\right)_{3}\right]^{n\pm}, \left[M\left(AA\right)_{2}a_{2}\right]^{n\pm}, \left[M\left(AA\right)_{2}ab\right]^{n\pm}$ and $\left[M\left(AB\right)_{3}\right]^{n\pm}.$ Thus, among the given options, only $[Co(en)_3]^{3+}$ shows optical isomerism.
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Notes on coordination compounds

Concepts Used:

Coordination Compounds

A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.

Coordination entity:

A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.

Ligands:

A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.