Q. Which of the following does not show optical isomerism?
A) [Co(NH₃)₃Cl₃]⁰
B) [Co(en)Cl₂(NH₃)₂]⁺
C) [Co(en)₃]³⁺
D) [Co(en)₂Cl₂]⁺ (en = ethylenediamine)
Explanation
[Solution from source] [Co(NH₃)₃Cl₃] is an MA₃B₃ octahedral complex; both its fac and mer forms have a mirror plane, so it is not optically active. [Co(en)₃]³⁺, cis-[Co(en)₂Cl₂]⁺ and one isomer of [Co(en)Cl₂(NH₃)₂]⁺ are chiral. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.