Due to the polar halogen-carbon bond in haloalkanes, they are more soluble than hydrocarbon in water. But the solubility is still very low because the overall influence of the dipole-dipole interaction is small.
But why does the influence of the halogen decreases as the length of the carbon chain increases?
Shouldn't this be increasing the solubility of haloalkanes in water instead? As an increase of carbon in the chain translate to more electrons and more movements of electrons increase the dispersion forces. This increase in inter-molecular forces means that its closer to of the strength of hydrogen bonding in water