COMEDK20269 May 2026Evening ShiftChemistryCoordination CompoundsActual
Which one of the following complex-isomerism pair matches correctly?
Options
- A[ CrCl ₂(ox)₂]³⁻ - Exhibits cis- trans isomerism and cis isomer is optically active
- B[ PtCl ₂( NH ₃)₂] - Exhibits both cis- trans and optical isomerism
- C[ Cr(C ₂ O ₄)₃]³⁻ - Exhibits cis- trans isomerism but is optically inactive
- D[ Fe(CN) ₄( NH ₃)₂]^- - Exhibits cis- trans isomerism and both exhibit optical isomerism
Correct answer
A. [ CrCl ₂(ox)₂]³⁻ - Exhibits cis- trans isomerism and cis isomer is optically active
Step-by-step solution
[ CrCl ₂(ox)₂]³⁻ is an octahedral complex of the type [M(AA)₂a₂] . It exhibits geometrical isomerism, existing as cis and trans isomers. The trans isomer has a plane of symmetry and is optically inactive. The cis isomer lacks any plane or center of symmetry and is optically active, existing as a pair of enantiomers. [ PtCl ₂( NH ₃)₂] is a square planar complex of the type [Ma₂b₂] . It exhibits geometrical isomerism (cis and trans) but is optically inactive due to the presence of a molecular plane of symmetry. [ Cr(