Home › NEET UG › Chemistry › Coordination Compounds ›  Which of the following square-planar complexes shows cis-trans (geometrical) isomerism?
A[Pt(NH₃)₄]²⁺
B[PtCl₄]²⁻
C[Pt(NH₃)₂Cl₂]
D[Ni(CO)₄]
Answer & Solution
Correct answer: C. [Pt(NH₃)₂Cl₂]
**[Pt(NH₃)₂Cl₂]** (cisplatin/transplatin) is square-planar MX₂L₂ → exhibits *cis* and *trans* isomers. **cis-[Pt(NH₃)₂Cl₂]** is the famous anti-cancer drug; *trans* is inactive. Tetrahedral complexes (e.g., [Ni(CO)₄]) do NOT show geometrical isomerism.
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