JEE Main2007ChemistryCoordination CompoundsActual
Which one of the following has a square planar geometry?
Options
- A[ CoCl ₄ ]²⁻
- B[ FeCl ₄ ]²⁻
- C[ NiCl ₄ ]²⁻
- D[ PtCl ₄ ]²⁻
Correct answer
D. [ PtCl ₄ ]²⁻
Step-by-step solution
₂₇ Co ²⁺ - 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^7 4 s^0 As Cl ⁻ is weak field ligand so no pairing up. Hence it is sp^3 hybridized giving tetrahedral geometry. Fe ²⁺ - 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^6 4 s^0 Due to Cl ⁻ , back pairing is not observed so it will be sp ^3 hybridized giving tetrahedral geometry. Ni ²⁺-1 s ^2 2 s ^2 2 p ^6 3 s ^2 3 p^6 3 d ^8 4 s ^0 Because weak ligand, back pairing is not observed so it will be sp ^3 i.e. tetrahedral geometry. All the complexes of Pt ²⁺ are square planar including thos