Question

Which of the following best describes a Lewis base?

Answer 1

Answer: Option (C) is the correct answer.

Explanation:

According to Lewis, a base is a substance or specie which is able to donate electrons.

For example, $NH_{3}$ is a lewis base because nitrogen has a lone pair of electron.

Therefore, when ammonia is dissolved in HCl it will accept the hydrogen atom as nitrogen gave electron to the hydrogen atom. As a result, hydrogen bonds with nitrogen atom.

             $NH_{3} + HCl \rightarrow NH^{+}_{4}Cl^{-}$  

Thus, we can conclude that it donates electrons in solution best describes a Lewis base.

Answer 2

Not 100% sure but I believe it is C.