• # question_answer Which of the following complex species is not expected to exhibit optical isomerism?  A) ${{[Co{{(en)}_{3}}]}^{3+}}$ B) ${{[Co{{(en)}_{2}}C\,{{l}_{2}}]}^{3+}}$ C) $[Co{{(N{{H}_{3}})}_{3}}C\,{{l}_{3}}]$ D)  ${{[Co(en)\,{{(N{{H}_{3}})}_{2}}\,C{{l}_{2}}]}^{+}}$

$[Co(N{{H}_{3}})\,C{{l}_{3}}]$how facial as well as meridional isomersm. But both contain plane of symmetry. So, the answer is (3)