Do all Lewis acid-base reactions involve protons?

Question

Chemistry Question

Answer 1

No. Not all Lewis acid-base reactions do NOT involve protons.  Here is an example:

BF₃ + F^- ===> BF₄^-

The BF₃ is the Lewis acid as it accepts a pair of electrons to make the bond with F

The F^- is the Lewis base as it donates the pair of electrons to make the bond with BF₃