Question

This Lewis structure

is an example of an
exception.
A.
odd
electron
B.
expanded
octet
C.
incomplete
octet

Answer 1

I believe the answer is incomplete octet.

Step-by-step explanation:

My chemistry is a bit rusty but since the central Boron atom has only 6 valence electrons (it is sharing two with each individual Cl molecule), as opposed to the customary 8, the Lewis structure is an incomplete octet.