Question

Which among the following qualifies as a Lewis base?

• A. $B{Cl}_3$
• B. ${CH}_4$
• C. ${PH}_3$
• D. ${NH}_3$

Answer 1

Answer: (C), (D)

${PH}_3$
${NH}_3$

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.