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Which constraint arises when a transition metal complex has weak-field ligands?

A)Higher spin state is disfavored
B)Orbital energy gap is reduced
C)Crystal defects become more numerous
D)Bond lengths get proportionally shorter

💡 Explanation

Weak-field ligands cause a smaller splitting of d-orbitals due to decreased electrostatic interaction; therefore the orbital energy gap decreases between the t₂g and e g orbitals, rather than strong-field ligands causing maximized splitting.

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