Q. Which of these is least likely to act as a Lewis base ?
A) CO
B) F–
C) BF₃
D) PF₃
Explanation
[Solution from source] A Lewis base donates an electron pair. CO, F⁻ and PF₃ all have lone pairs to donate, but boron in BF₃ has only six valence electrons and accepts a pair, so BF₃ is a Lewis acid. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.