To solve this problem, we need to analyze the nature of the alkaline earth metal halides given in the options.$\newline$Alkaline earth metals include beryllium, magnesium, calcium, strontium, and barium.$\newline$The halides of these metals can vary in their covalent or ionic character.$\newline$Let's consider each option:$\newline$• Option 1: Calcium chloride (CaCl$_2)$ is an ionic compound and is soluble in water, not in organic solvents.$\newline$• Option 2: Strontium chloride (SrCl$_2)$ is also ionic and soluble in water.$\newline$• Option 3: Magnesium chloride (MgCl$_2)$ is ionic and soluble in water.$\newline$• Option 4: Beryllium chloride (BeCl$_2)$ is different because it exhibits covalent character.$\newline$Beryllium chloride forms a polymeric chain structure in the solid state, which is indicative of covalent bonding.$\newline$This covalent nature allows BeCl$_2$ to be soluble in organic solvents such as ethanol and ether.$\newline$Therefore, among the given options, beryllium chloride is the one that is covalent and soluble in organic solvents.$\newline$This corresponds to Option 4.