question_answer

In which of the following pairs both the completes show optical isomerism?

A)  \[cis-\,\,{{\left[ Cr{{({{C}_{2}}{{O}_{4}})}_{2}}C{{l}_{2}}^{\,} \right]}^{3}}^{-},\,\,cis-\left[ Co{{(N{{H}_{3}})}_{4}}Cl \right]\]

B)  \[\left[ PtCl\,(dien) \right]Cl,\,\,{{[NiC{{l}_{2}}B{{r}_{2}}]}^{\,2\,-}}\]

C)  \[[CO(N{{O}_{3}}){{(N{{N}_{3}})}_{3}}],\,\,cis\,\,-[Pt{{(en)}_{2}}]C{{l}_{2}}]\]

D)  \[\left[ Co{{\left( en \right)}_{3}} \right]C{{l}_{3}}, \,cis\,-\,\,\left[ Co{{\left( en \right)}_{2}}C{{l}_{2}} \right]Cl\]

Correct Answer: D

Solution :

\[\left[ Co{{\left( en \right)}_{3}} C{{l}_{3}} \right]\,\,i.e.,\,\,{{\left[ Co{{(en)}_{3}} \right]}^{3\,+}}\] \[cis-[Co{{(en)}_{2}}C{{l}_{2}}]\,\,i.e.,\,\,cis-{{[Co{{(en)}_{2}}\,C{{l}_{2}}]}^{2\,+}}\]