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QUESTION
Is BBr3 a lewis acid or base?
##BBr_3## is a Lewis Acid
The reason it is a Lewis Acid is because it is an electron-pair acceptor.
A fairly easy way to see this is to draw the Lewis dot structure of the molecule.
You'll find that ##"Boron"## has an incomplete octet. Generally, molecules that violate the octet rule act as Lewis Acids.
