Question

Figure 19.18 shows that the cis isomer of $\mathbf{[}\mathbf{Co}\mathbf{(}\mathbf{en}{\mathbf{)}}_{\mathbf{2}}{\mathbf{Cl}}_{\mathbf{2}}{\mathbf{]}}^{\mathbf{+}}$is optically active, where as the trans isomer is not optically active. Is the same true for $\mathbf{[}\mathbf{Co}\mathbf{(}{\mathbf{NH}}_{\mathbf{3}}{\mathbf{)}}_{\mathbf{4}}{\mathbf{Cl}}_{\mathbf{2}}{\mathbf{]}}^{\mathbf{+}}$.

Short answer

Yes, it is the same for$[\mathrm{Co}({\mathrm{NH}}_3{)}_4{\mathrm{Cl}}_2{]}^{+}$

Step-by-step solution

Optical activity/inacitivity condition

If the mirror image of any compound is super imposable to each other then the compound should be optically inactive or not super imposable to each other compound should be optically inactive. In other ways compound possess plane of symmetry is optically inactive.

Draw the diagram