For the reaction of BH₃ and CH₃NH₂, which diagram shows the correct flow of electrons from the Lewis base to the Lewis acid?

Classify the following molecules and ions as Lewis acids or bases.

i) H₃C⁺

ii) CO

iii) AlCl₃

iv) CH₂=CH₂

Determine whether the following is a Lewis acid or a Lewis base

PH₂CH₂

BF₃

AlCl₃

Br^-