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The molecule that contains nonpolar covalent bonds is Cl2. In Cl2, the two chlorine atoms share a pair of electrons equally because they have the same electronegativity. This equal sharing of electrons results in a nonpolar covalent bond. Because there is no difference in electronegativity between the two chlorine atoms, the electron cloud is symmetrically distributed around the molecule, leading to no partial charges.

In contrast, NaCl is an ionic compound, formed by the transfer of electrons from sodium to chlorine, which results in the creation of charged ions. He2 is a diatomic molecule of helium, which also does not involve covalent bonding in the traditional sense since helium atoms do not bond with each other. CO2 contains two polar covalent bonds between carbon and oxygen, but due to the linear geometry of the molecule, it is overall nonpolar; however, the bonds themselves are classified as polar due to the difference in electronegativity.

Thus, Cl2 uniquely showcases nonpolar covalent bonding in its molecular structure.