Question

Which of the following complex species is not expected to exhibit optical isomerism?

• A. $\left[Co\right(en\left)\right(N{H}_3{)}_{2}C{l}_2{]}^{+}$
• B. $\left[Co\right(en{)}_3{]}^{3+}$
• C. $\left[Co\right(en{)}_{2}C{l}_2{]}^{+}$
• D. $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$

Answer 1

The correct option is D $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$

The complex species $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$ is not expected to exhibit optical isomerism. It shows geometrical isomerism in the form of facial (cis)-isomerism (trans) isomerism due to presence of plane of symmetry.