question_answer

Optical isomerism is exhibited by (\[\text{oX}\,\text{=}\]oxalate anion; \[\text{en}\,\text{=}\]ethylenediamine).

A)  \[cis-{{[CrC{{l}_{2}}{{(ox)}_{2}}]}^{3-}}\]

B)  \[{{[Co{{(en)}_{3}}]}^{3+}}\]

C)  \[trans-{{[CrC{{l}_{2}}{{(ox)}_{2}}]}^{3-}}\]

D)  \[{{[Co(ox){{(en)}_{2}}]}^{+}}\]

Correct Answer: A

Solution :

trans\[{{[CrC{{l}_{2}}{{(ox)}_{2}}]}^{3-}}\]  isomer-optically inactive (superimposable mirror images and plane of symmetry). cis \[-{{[CrC{{l}_{2}}{{(ox)}_{2}}]}^{3-}},{{[Co{{(en)}_{3}}]}^{3+}}\]and \[{{[Co(ox){{(en)}_{2}}]}^{+}}\] exhibited optical isomerism.