Question

Which of the following will qualify as Lewis base ?

• A. $N{H}_3$
• B. $P{H}_3$
• C. Both A and B
• D. $BC{l}_3$

Answer 1

The correct option is C Both A and B

According to Lewis concept of acids and bases, an acid is a substance which can accept a lone pair of electrons whereas a base is a substance which can donate a lone pair of electrons.
Type of lewis base
Neutral molecules containing a lone pair of electrons on the central atom like $P{H}_3,N{H}_3$​. Such molecules can readily donate their lone pairs and hence qualify as Lewis bases.
While $BC{l}_3$ cannot donate a lone pair of electrons.