I have been struggling over this weekend to find an answer for the overall polarity of this molecule: 2,3,7,8-tetrachlorobenzofuran
In order to find intramolecular forces, I determined the difference in electronegativity:
C-C = 0 and C-H = 0.4 --> non-polar covalent bond
C-O = 0.8 --> polar covalent bond C-Cl = 0.6 --> polar covalent bond
As the molecular shape is not symmetrical, and there are polar bonds present (unbalanced), I thought it is a polar molecule. However, the research suggests that it is "non-polar molecule, therefore insoluble in water".
Can I ask the reason why it is considered a non-polar molecule?