Introduction to Chemistry

Question

Explain, using Valence Bond Theory why a C-O bond is stronger than a C-Br bond?

Answer 1

CO bond is a triple bond and CBr bond is a single bond

Lewis structures

:CΞO:

:C-Br: add two more lone pairs on both carbon and bromine

Answer 2

Br is closer to the noble gases and they do not like to be in bonds at all. They already have their octet full. Br is a lot closer to them when compared to O or oxygen. O is valence 2, Br is valence 1, noble gases have no valence.