Question:
Which of the following complex is optically active?
Which of the following complex is optically active?
Show Hint
Cis-chelates are almost always chiral in octahedral geometry.
Updated On: Apr 28, 2026
- $trans-[CrCl_{2}(ox)_{2}]^{3-}$
- $trans-[PtCl_{2}(en)_{2}]^{2+}$
- $cis-[Pt(NH_{3})_{2}]Cl_{2}$
- $trans-[Pt(NH_{3})_{2}]Cl_{2}$
- $cis-[PtCl_{2}(en)_{2}]^{2+}$
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The Correct Option is
Solution and Explanation
Step 1: Concept
A molecule is optically active if it lacks a plane of symmetry (is chiral).
Step 2: Meaning
Trans isomers of octahedral complexes with bidentate ligands often have a plane of symmetry.
Step 3: Analysis
The $cis$ isomer of $[M(AA)_2X_2]$ type lacks a plane of symmetry and its mirror image is non-superimposable.
Step 4: Conclusion
Therefore, $cis-[PtCl_2(en)_2]^{2+}$ is optically active. Final Answer: (E)
A molecule is optically active if it lacks a plane of symmetry (is chiral).
Step 2: Meaning
Trans isomers of octahedral complexes with bidentate ligands often have a plane of symmetry.
Step 3: Analysis
The $cis$ isomer of $[M(AA)_2X_2]$ type lacks a plane of symmetry and its mirror image is non-superimposable.
Step 4: Conclusion
Therefore, $cis-[PtCl_2(en)_2]^{2+}$ is optically active. Final Answer: (E)
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