Question:

Which of the following does not have optical isomer?

Updated On: Jul 27, 2022
  • $\left[ Co \left( NH _{3}\right)_{3} Cl _{3}\right]$
  • $\left[ Co ( en )_{3}\right]^{3+}$
  • $\left[ Co ( en )_{2} Cl _{2}\right] Cl$
  • $\left[ Co ( en )\left( NH _{3}\right)_{2} Cl _{2}\right] Cl$
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The Correct Option is A

Solution and Explanation

Octahedral complexes of type $\left[M a_{2} b_{2} c_{2}\right]$, $[M a b c d e f],\left[M(A A)_{3}\right],\left[M(A A)_{2} a_{2}\right]$, $\left[M(A A) a_{2} b_{2}\right],\left[M(A A)_{2} a b\right]$ and $\left[M(A B)_{3}\right]$ show optical isomerism due to asymmetric molecules. Octahedral complexes of type $\left[M a_{4} b_{2}\right]$ and $\left[ Ma _{3} b _{3}\right]$ do not show optical isomerism due to presence of plane of symmetry. Hence $\left[ Co ( NH )_{3} Cl _{3}\right]$ will not show optical isomerism.
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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.