question_answer

The optically active coordination complex ion among the following is

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

B)  \[cis{{[Co(en){{(N{{H}_{3}})}_{6}}]}^{2+}}\]

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

D)  \[{{[Fe{{(CN)}_{6}}]}^{3-}}\]

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,\[cis{{[(en){{(N{{H}_{3}})}_{2}}C{{l}_{2}}]}^{+}}\]exhibits optical isomerism. Its optically active forms are as: Only cis form of te+rahedral complexes of the type\[{{[M{{(aa)}_{2}}{{x}_{2}}]}^{+}}\]is optically active.