The definition of a Lewis base is:

Question

Quizplus · Accepted Answer

A Lewis base is defined as a species that donates a pair of electrons to form a covalent bond. This means that it is an electron pair donor. Choice B, proton donor, is actually the definition of a Brønsted-Lowry acid. Choice C, boron trifluoride, is a Lewis acid, not a Lewis base. Choice D, electron pair acceptor, is describing a Lewis acid, which is the opposite of a Lewis base. Choice E, electrophile, refers to a species that is attracted to electrons and can act as a Lewis acid, but it is not a definition of a Lewis base.

The Definition of a Lewis Base Is