sodium benzoate and ethly 4-aminobenzoate hydrochloride are ionic compounds, thus they are more soluble in water. The left three compounds are covalently bonded, thus more soluble in organic solvent such as methlene chloride. Solution sodium benzoate and ethly 4-aminobenzoate hydrochloride are ionic compounds, thus they are more soluble in water. The left three compounds are covalently bonded, thus more soluble in organic solvent such as methlene chloride..