Chemistry - Coordination Chemistry Question with Solution | TestHub
The pair(s) of complexes where in both exhibit tetrahedral geometry is(are)
Options:(select one or more)
Answer:
Solution:
Question Explanation:
We must identify pairs of coordination complexes where both members have tetrahedral geometry, based on metal oxidation state, d-electron count, ligand type, and crystal field strength.
Concept:
Tetrahedral geometry is favored by weak-field ligands, high-spin configurations, and d10 suitable dn metal centers; strong-field ligands often give square planar for d8 metals.
Solution:
Question Explanation:
We must identify pairs of coordination complexes where both members have tetrahedral geometry, based on metal oxidation state, d-electron count, ligand type, and crystal field strength.
Concept:
Tetrahedral geometry is favored by weak-field ligands, high-spin configurations, and d¹⁰ suitable dⁿ metal centers; strong-field ligands often give square planar for d⁸ metals.
Solution:
Option Complex Metal (OS, d-count) Geometry Reason
1 [FeCl₄]⁻ Fe³⁺ (d⁵) Tetrahedral Weak-field Cl⁻, high-spin
[Fe(CO)₄]²⁻ Fe²⁻ (d¹⁰) Tetrahedral d¹⁰ favors tetrahedral
2 [Co(CO)₄]⁻ Co⁻ (d¹⁰) Tetrahedral d¹⁰ metal carbonyl
[CoCl₄]²⁻ Co²⁺ (d⁷) Tetrahedral Weak-field Cl⁻
3 [Ni(CO)₄] Ni⁰ (d¹⁰) Tetrahedral d¹⁰
[Ni(CN)₄]²⁻ Ni²⁺ (d3) Square planar Strong-field CN⁻
4 [Cu(py)₄]⁺ Cu- (d10) Tetrahedral d10
[Cu(CN)₄]³⁻ Cu⁺ (d¹⁰) Tetrahedral d¹⁰
Final answer: Options (A, B, and D)