List three physical properties of covalent compounds and give reason for each.

(N/A) $(i)$ Covalent compounds have low melting and boiling points because the intermolecular forces between them are weak.
$(ii)$ Generally,these are poor conductors of electricity because the electrons are shared between atoms and no free charged particles (ions) are formed.
$(iii)$ Generally,covalent compounds are soluble in organic solvents,such as ether or benzene,and are insoluble in water. This is because these compounds are typically non-polar and follow the principle of 'like dissolves like',meaning they dissolve in non-polar solvents.