Answer: Alkyl halides contain C-Hal bond. The bond is polar, because halogens are more polar that Carbon. There are dipole-dipole interactions between alkyl halides. Water also polar molecule, but there are hydrogen bonds between these molecules. When water and an alkyl halide are mixed, we see two immiscible layers. The reason lies in the fact that dipole-dipole interactions between molecules of alkyl halides and water are weaker than interactions into layers between water molecules and alkyl halides separately.