Given data : It is given to identify alkyl halides are almost insoluble in water because Explanation

Hydrogen bonds hold the water molecules together. Alkyl halides cannot form hydrogen bonds with water because the new forces of attraction between water and alkyl halide molecules are smaller than the forces of attraction already present between alkyl halide-alkyl halide molecules and water-water molecules. Despite having a high electronegativity, chlorine does not exhibit H-bonding because of its larger size. Between two distinct molecules of the same or different substances, it is created. H-bonds, for instance, are found in water molecules. 

Hence the correct option (C) .They do not form hydrogen bonds with water.