Physical Properties
Haloalkanes display higher boiling points than the corresponding alkanes. This is experimental evidence of the carbon-halogen bond polarization that makes molecules strongly attract one another by dipole-dipole forces, not possible in alkanes.
Going down the Periodic Table within the halogen group, boiling points of the corresponding haloalkanes increase because halogen atomic weight, size and polarizability increase, the London forces thus getting stronger.
While many water-immiscible organic compounds are lighter than water, alkyl halides are denser and stay at the bottom of a separating funnel.
