The solubility rule says that LIKE DISSOLVES LIKE. Thus, non-polar compounds are soluble in non-polar solvents like hexane and polar compounds are soluble in polar solvents like water.
CCl4 is a non-polar compound and it is soluble in only non-polar solvents.
Water is a polar solvent.
Hence, CCl4 is insoluble in water as a non-polar compound is insoluble in a polar solvent.