Q. Which of the following is not a Lewis acid?
A) $BF_{3}$
B) $AlCl_{3}$
C) $SO_{2}$
D) $H_{2}O$
Explanation
(d)
According to Lewis, electron deficient species are called acids while bases are the substances which have unshared pair of electron and can donate the electron pair to the formation of coordinate bond. Hence, $H_{2}\ddot{O}$: is a Lewis base while $BF_{3},AlCl_{3}\ and\ SO_{2}\$are Lewis acids.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.