Talking about solubility of this compounds in water, fluorine reacts with water violently. We can explain the high reactivity of fluorine attending to the law value of its dissociation energy. If we draw the molecular orbitals diagram of the molecule of fluorine, we notice that there are two not bonding p orbitals with 4 electrons. The repulsion force created by these electrons could be the reason of the low dissociation energy.
As we can see, fluorine is a diamagnetic molecule with a bond coefficient one
Chlorine dissolves in water, and in fact chlorine reacts with water but not as fluorine does.
The solubility of bromine and iodine is low, but it could be better if we add KBr or KI.
Finally, the solubility of iodine is high in carbon tetrachloride and in carbon disulphide. In the first compound the solution is purple. Iodine can also solve in ethanol and the color of these solutions is red. Iodine can be absorbed by starch, and the solution turns to purple
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