Question

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

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

Answer 1

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

$\left[Co\right(N{H}_3{)}_{3}C{l}_3]$ exists in the geometrical forms fac and mer isomer.

Both these forms are optically inactive. Therefore, $\left[Co\right(N{H}_3{)}_{3}C{l}_3]$ does not show optical isomerism.