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The d-orbital electronic configuration of the complex among [Co(en)3]3+, [CoF6]3−, [Mn(H2O)6]2+, [Zn(H2O)6]2+ that has the highest CFSE is (1) t2g3 eg2 (2) t2g6 eg4 (3) t2g6 eg0 (4) t2g4 eg2

1. t2g3 eg2
2. t2g6 eg4
3. t2g6 eg0
4. t2g4 eg2

Correct answer: t2g6 eg0

Solution

The configuration t2g6 eg0 indicates that all six d-electrons are in the lower energy t2g orbitals, maximizing the crystal field stabilization energy (CFSE) by minimizing electron repulsion and maximizing pairing energy, which results in the highest CFSE among the given options.

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