Question

Which of the following is not a Lewis base?

(A) NH₃
B) H
(C) BF₃
(D) H₂O
(E) H₃C

Answer 1

BF₃ is not a Lewis base because it does not have a free electron pair that can be donated.

Step-by-step explanation:

A Lewis base is a species that donates an electron pair. To determine which of the options is not a Lewis base, we need to identify the species that cannot donate an electron pair. An electron pair is required to form a coordinate bond with a Lewis acid. Among the given options, (C) BF₃ is not a Lewis base because it does not have a free electron pair that can be donated. BF₃ is a Lewis acid because it accepts an electron pair from a Lewis base.