question_answer

The optically active coordination complex ion among the following is

A)  trans\[{{[Co{{(en)}_{2}}C{{l}_{2}}]}^{+}}\]

B)  \[cis{{[Co(en){{(N{{H}_{3}})}_{2}}C{{l}_{2}}]}^{+}}\]

C)  \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]

D)  \[{{[Fe(C{{N}_{6}})]}^{3-}}\]

Correct Answer: B

Solution :

 Usually optical isomerism is exhibited by \[[M{{(aa)}_{3}}]\]or \[[M{{(aa)}_{2}}{{X}_{2}}]\]or \[[M(aa){{X}_{2}}1/2]\]type complexes.    (Here    M = metal    atom, \[aa=\]bidentate ligand X, and Y = unidentate ligand).   Hence,\[cis[Co{{(en{{(N{{H}_{3}})}_{2}}C{{l}_{2}}]}^{+}}\] exhibits optical isomerism. Its optically active forms are as: Only \[cis\]form of te+rahedral complexes of the type\[{{[M{{(aa)}_{2\,\times \,2}}]}^{+}}\]is  optically active.