[yuheng_wu]

Why is the boiling point of CH₃Cl higher than the boiling point of HCl? My reasoning was that CH₃Cl is more polar than HCl, since ΔEN (H-Cl)= 0.9 and ΔEN (C-Cl)=0.5 and therefore the boiling point of HCl should be higher than CH₃Cl, but this is incorrect? Can someone tell me how to see it correctly please?

[AWK]

The boiling point does not directly depend on the difference in electronegativity of two atoms in a more complex molecule. The problem is much more complicated.
https://www.ias.ac.in/article/fulltext/reso/012/06/0043-0057

[yuheng_wu]

The boiling point does not directly depend on the difference in electronegativity of two atoms in a more complex molecule. The problem is much more complicated.
https://www.ias.ac.in/article/fulltext/reso/012/06/0043-0057

In these molecules there is a dipole force in both atoms because ΔEN of both molecules are higher than 0,4, is this correct? Then the dispersion force is greater in CH3Cl and therefore the boiling point is higher? I understand that it is very complex, but with these molecules it should be possible to know.

[AWK]

Read this article,