Question

Which one of the following octahedral complexes will not show geometrical isomerism?(A and B are monodentate ligands )

• A. $\left[M{A}_4{B}_2\right]$
• B. $\left[M{A}_{5}B\right]$
• C. $\left[M{A}_2{B}_4\right]$
• D. $\left[M{A}_3{B}_3\right]$

Answer 1

The correct option is B $\left[M{A}_{5}B\right]$

$\left[M{A}_3{B}_3\right]$ - 2 geometrical isomers
$\left[M{A}_2{B}_4\right]$ - 2 geometrical isomers
$\left[M{A}_4{B}_2\right]$ - 2 geometrical isomers
The complexes of general formula $\left[M{A}_6\right]$ and $\left[M{A}_{5}B\right]$ octahedral geometry do not show geometrical isomerisM.