Both benzoic acid and p tert butylphenol are soluble in a mixture of ethanol and water because of presence of carboxyl and hydroxyl group in them because of which they form Hydrogen bonding with alcohol and water. Solution Both benzoic acid and p tert butylphenol are soluble in a mixture of ethanol and water because of presence of carboxyl and hydroxyl group in them because of which they form Hydrogen bonding with alcohol and water..