Question

which of the following do not obey the Octet rule ? a) O2 b) F2 c) Bcl3. d) N2

Answer 1

BCl3 do not obey octet rule.It is a electron deficient molecule.As it share only three electron with chlorine atom .
After forming a molecule boron has only six electrons I.e three from chlorine atom and three of its own.
whereas oxygen molecule will be achieving octet rule,by sharing two electrons with other oxygen atom.
whereas fluorine molecule will be achieving octet by sharing one electron.
Nitrogen molecule will be achieving octet by sharing three electrons.
These all are covalent molecules.

Answer 2

c) BCl3 don't obey the octet rule because it leaves boron with just 6 outer shell electrons.