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All transition metal ions form complexes more readily than main-group metal ions. Which is the LEAST important reason?
ASmaller cation size
BHigher ionic charge
CVacant d orbitals available for ligand donation
DTheir high boiling points
Answer & Solution
Correct answer: D. Their high boiling points
Transition metals form many complexes because of **(i) small size, (ii) high charge density, (iii) vacant d orbitals to accept ligand lone pairs**. Boiling point is unrelated to complex-forming ability — that's the wrong answer.
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