Question

Chiral complex from the following is 

 

• A. trans – [Co(NH₃)₄Cl₂] ⁺
• B. cis – [PtCl₂(en)₂] ²⁺
• C. cis – [PtCl₂(NH₃)₂]
• D. trans – [PtCl₂(en)₂] ²⁺

Hint:

For identifying chiral complexes:
• Check for the absence of planes of symmetry or center of symmetry.
• Cis configurations with bidentate ligands (like en) often result in chiral complexes.
• Trans configurations are usually symmetric and achiral.

Answer 1

The Correct Option is B

Chirality in coordination complexes occurs when the complex lacks a plane of symmetry.
- For the given complexes:
   cis–[PtCl\(_2\)(en)\(_2\)]\(^{2+}\): The cis arrangement of ethylene diamine (en) ligands around the Pt center creates a chiral structure.
   trans–[PtCl\(_2\)(en)\(_2\)]\(^{2+}\): The trans arrangement is symmetric, making the complex achiral.
   cis–[PtCl\(_2\)(NH\(_3\))\(_2\)]: The complex has a plane of symmetry and is not chiral.
   trans–[Co(NH\(_3\))\(_4\)Cl\(_2\)]\(^+\): The trans arrangement of ligands makes the complex symmetric and achiral.
Final Answer: (1) cis–[PtCl\(_2\)(en)\(_2\)]\(^{2+}\).