Question

CuCl is slightly covalent and insoluble in water whereas NaCl is ionic and highly soluble in water. Comment. Y

Answer 1

this is mainly because elements bonded together in covalent bonds are insoluble in water and are soluble in oil, kerosene. since CuCl is in covalent bond, it is insoluble.
ionic bonds are soluble in polar solvents like water and insoluble in kerosene and oil. since NaCl is in ionic bond, it is soluble in water.