Question

Which will show geometrical isomerism?

• A. $\left[M{A}_{4}B\right]$
• B. $\left[M{A}_2{B}_4\right]$
• C. $\left[M{A}_3{B}_3\right]$
• D. $\left[M{A}_4{B}_2\right]$

Answer 1

Answer: (B), (C), (D)

$\left[M{A}_4{B}_2\right]$

Remember, geometrical isomerism refers to cis trans isomerism. So we need at least two different ligands to show this. From among the options given here, these exhibit geometrical isomerism.
$\left[M{A}_4{B}_2\right]\left[M{A}_2{B}_4\right]\left[M{A}_3{B}_3\right]$

We have just seen why in detail in the videos.
All of these are octahedral and can show cis trans isomerism, the first option has just 5 ligands and is not a candidate for geometrical isomerism.