Final answer:
The gas expected to be most soluble in water is the one that is the most polar. Out of the given options, none of the gases (CH4, CCl4, CHCl3) are polar, so none of them are expected to be highly soluble in water.
Step-by-step explanation:
The most soluble gas in water will be the one that is the most polar. Polar molecules have an uneven distribution of charge, resulting in a positive and negative end. Water is a polar molecule and can form hydrogen bonds with other polar molecules. Therefore, the gas expected to be most soluble in water is the one that is the most polar.
Out of the choices given, none of the gases (CH4, CCl4, CHCl3) are polar. They are all nonpolar molecules because their bond dipoles cancel each other out. Therefore, the correct answer is D. None of the above gases are expected to be highly soluble in water.