Explanation: Carbon tetrachloride (CCl₄) is a covalent compound because it is formed by the sharing of electrons between carbon and chlorine atoms. In covalent bonding, atoms share electrons to achieve a full outer electron shell.

The other compounds listed—Calcium chloride (CaCl₂), Magnesium fluoride (MgF₂), and Sodium chloride (NaCl)—are ionic compounds, where electrons are transferred from one atom to another, resulting in the formation of positively and negatively charged ions.