Answer: Cisplatin [cis-Pt(NH3)2Cl2] by exploiting that Cl- has stronger trans-labilising effect than NH3.
- A Cisplatin [cis-Pt(NH3)2Cl2] by exploiting that Cl- has stronger trans-labilising effect than NH3
- B A largely random, loosely controlled mixture of cis and trans geometric isomers in many documented cases
- C Mainly the trans isomer of the platinum complex with little cis product formed according to conventional understanding
- D Octahedral platinum complexes formed instead of the intended square planar product in routine practice
Correct answer: A. Cisplatin [cis-Pt(NH3)2Cl2] by exploiting that Cl- has stronger trans-labilising effect than NH3
Explanation: Trans effect: by starting with [PtCl4]2- and adding NH3, Cl- labilises the trans position; the second NH3 goes cis because of the kinetic trans effect, giving cisplatin.
Aqueous solutions of transition metal ions show characteristic colours caused by electrons absorbing visible light to jump between split d-orbitals; the exact colour depends on the metal, its oxidation state, and surrounding ligands.
Concept context
Transition metals (d-block) and lanthanides/actinides (f-block). Known for coloured compounds, variable oxidation states, complex formation, and catalytic properties. Frequently tested in JEE and NEET.