Which one of the following is a Lewis acid but not a Brønsted-Lowry acid?

Question

Quizplus · Accepted Answer

A Lewis acid is a substance that can accept a pair of electrons, while a Brønsted-Lowry acid is a substance that can donate a proton (H+). Fe³⁺ can act as a Lewis acid because it can accept a pair of electrons, but it cannot donate a proton and therefore cannot act as a Brønsted-Lowry acid. The other choices all have a hydrogen atom that can donate a proton, making them both Lewis and Brønsted-Lowry acids.

Which One of the Following Is a Lewis Acid but Not