Q. Which is Lewis acid?
A) $BF_{3}$
B) $NF_{3}$
C) $Cl^{-}$
D) $H_{2}O$
Explanation
(a)
Electron acceptors are Lewis acids. They are electron deficient compounds. $BF_{3}$ is Lewis acid because B has only 6 electrons in its valence shell and it can accept electrons. $NF_{3},\ Cl^{-}\$and$\ H_{2}O$ have lone pair of electrons. Thus, they are electron donors and Lewis bases.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.