Question

Which one of the following coordination entity is chiral ?

• A. $trans-[CrC{l}_2(ox{)}_2{]}^{3-}$
• B. $cis-[Co(N{H}_3{)}_{4}C{l}_2{]}^{+}$
• C. $cis-[CrC{l}_2(ox{)}_2{]}^{3-}$
• D. $trans-[Co(N{H}_3{)}_{4}C{l}_2{]}^{+}$

Answer 1

Answer: (C)

Octahedral complex of general formula $[M(AA{)}_{2}a2{]}^{n\pm }$ show optical isomerism. Trans form of $[M(AA{)}_{2}a2{]}^{n\pm }$ does not show optical isomerism due to symmetry.
$cis-[Co(N{H}_3{)}_{4}C{l}_2{]}^{+}$ and $trans-[Co(N{H}_3{)}_{4}C{l}_2{]}^{+}$ do not show optical isomerism due to symmetry.