Which of the following liquids is most soluble in water

benzene

ethanol

carbon tetrachloride

toluene

The rule of solubility states that, like dissolves like. Water is a polar compound. Hence compound that is most polar, will dissolve maximum in water.

Among to available options, ethanol has maximum polarity. Hence, its solubility will be maximum in water.

Other solvents like benzene, toluene and carbon tetrachloride are non-polar in nature. Hence, they show poor solubility in water.