The covalent compounds can dissolve in water but do not dissociate into ions. Therefore they are staying without reacting. These Covalent compounds are called intact molecules. Ions can react with other ions.  We can consider some of the covalent compounds such as Sucrose (C12H22O11), which is called Table sugar, ethanol (CH3CH2OH), and ethylene glycol (HOCH2CH2OH). These Covalent compounds have polar O-H bonds that interact with water and dissolve.  Covalent compound aqueous solutions can not conduct electric current because there are no ions in them. Therefore these are called nonelectrolytes.  Some of the covalent compounds do not have O-H bonds, so these do not dissolve in water. The example for these covalent compounds is Benzene (C6H6), and octane(C8H18), which do not have O-H bonds. Some of the covalent compounds contain the H group, which strongly reacts with water, and these covalent compounds dissociate to make ions. These substances are acids. ...