Which one of the following is expected to be the strongest Lewis acid?

Question

Quizplus · Accepted Answer

Fe³⁺ is expected to be the strongest Lewis acid among the given choices because it has the highest positive charge (+3) on the Fe atom. The higher the positive charge on the metal ion, the stronger the Lewis acid it becomes. Fe⁺ has a charge of +2 and Fe²⁺ has a charge of +1, making them weaker Lewis acids than Fe³⁺. Fe alone does not form a metal-ligand bond, so it cannot act as a Lewis acid in this context.

Which One of the Following Is Expected to Be the Strongest