Question

Which one of the following coordination entity is chiral ?

• A. $trans- [CrCl_2(ox)_2]^{3-}$
• B. $cis- [Co(NH_3)_4 Cl_2]^{+}$
• C. $cis- [CrCl_2(ox)_2]^{3-}$
• D. $trans- [Co(NH_3)_4 Cl_2]^{+}$

Answer 1

Answer: (C)

Octahedral complex of general formula $[M(AA)_2a2]^{n±}$ show optical isomerism. Trans form of $[M(AA)_2a2]^{n±}$ does not show optical isomerism due to symmetry.
$cis - [Co(NH_3)_4 Cl_2]^{+}$ and $trans- [Co(NH_3)_4 Cl_2]^{+}$ do not show optical isomerism due to symmetry.