COMEDK2023Morning ShiftChemistryCoordination CompoundsActual
Which of the following complex show optical isomerism? (i) c i s- [ COCl ( en )₂ ( NH ₃ ) ]²⁺ (ii) cis- [ CrCl ₂( ox )₂ ]³⁻ (iii) cis-[ . CO ( en )₂ Cl ₂ ] Cl (iv) cis- [ CO ( NH ₃ )₄ Cl ₂ ]⁺
Options
- A(i), (iv)
- B(i), (ii), (iv)
- C(i), (ii), (iii)
- D(i), (ii)
Correct answer
C. (i), (ii), (iii)
Step-by-step solution
Optical isomerism in coordination complexes occurs when the complex lacks a plane of symmetry or center of inversion, making it chiral. (i) cis-[CoCl(en)₂(NH₃)]²⁺ : This complex has two ethylenediamine (en) ligands and two different monodentate ligands. The cis-isomer lacks a plane of symmetry and is optically active. (ii) cis-[CrCl₂(ox)₂]³⁻ : This complex contains two bidentate oxalate (ox) ligands and two chloride ligands in cis positions. It lacks a plane of symmetry and is optically active. (iii) cis-[Co(en)₂Cl