This CFSE splitting diagram is for a complex with the Blank 1 Question 3[select: , square planar, octahedral, tetrahedral] geometry.

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Question restatement: This CFSE splitting diagram is for a complex with the Blank 1 Question 3 [select: , square planar, octahedral, tetrahedral] geometry.

Option analysis:
- Blank (no geometry specified): The purpose of a CFSE splitting diagram is to illustrate how d-orbitals split in a particular coordination geometry. If the geometry is not specified (blank), the diagram cannot be correctly interpreted because CFSE patterns are geometry-dependent. Therefore, leaving the geometry unspecified is inconsistent with identifying a single, correct CFSE pattern.

- Square planar: In square planar complexes, the d-orbital splitting is quite different from octahedral. The dx2−y2 orbital experiences the largest repulsion and sits at the highest energy, followed by other orbitals with a characteristic ordering that reflects a strong field along the planar axes. If your diagram shows the classic octahedral t2g/eg splitting, or follows the octahedral energy arrangement, it would not match the square planar pattern. Hence this option is unlikely to be correct for a standard octahedral-like CFSE diagram.

- Tetrahedral: Tetrahedral complexes have a different splitting pattern from octahedral ones because the ligands approach in positions that muffle certain lobes of the d-orbitals. The splitting magnitude is typically smaller (roughly 0.4Δt, with t2 set as lower in energy than e) and the ordering is inverted compared to octahedral. If the diagram presented is the classic octahedral t2g/eg scheme, it would not correspond to the tetrahedral arrangement, making this option incompatible with that diagram.

- Octahedral: The canonical CFSE diagram for an octahedral field shows the t2g set (dxy, dxz, dyz) lower in energy and the eg set (dz2, dx2−y2) higher, with a splitting amount Δoct. This yields the well-known energy pattern where electrons occupy the lower t2g orbitals before the higher eg orbitals, and the overall CFSE is commonly expressed in terms of −0.4Δoct for t2g and +0.6Δoct for eg (per electron, with signs reflecting stabilization or destabilization). If the diagram you’re examining shows this t2g/eg arrangement with the appropriate magnitude and ordering, it aligns with an octahedral geometry.

Putting it together: Each geometry yields a distinct CFSE pattern. The blank option cannot be evaluated without a specified geometry. Square planar and tetrahedral patterns diverge in orbital ordering and splitting magnitudes from the octahedral scheme, so unless the diagram explicitly matches those unique patterns, they are not correct for an octahedral CFSE diagram. The octahedral option is the one that corresponds to the standard CFSE splitting into t2g and eg sets.

General Inorganic Chemistry (CHEM2007 UNUK) (FYR1 24-25) Test Yourself 1

This CFSE splitting diagram is for a complex with the Blank 1 Question 3[select: , square planar, octahedral, tetrahedral] geometry.

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