Final answer:
The correct IUPAC name for CuCl2 is copper(II) chloride, indicating that the copper ion has a 2+ charge, balanced by two 1- chloride ions.
Step-by-step explanation:
The correct name for the compound CuCl2 according to IUPAC nomenclature is copper(II) chloride. Copper can form cations with either a 1+ or 2+ charge. In this case, the compound contains the copper ion with a 2+ charge, as each chlorine (chloride ion, Cl−) has a 1− charge, and two chloride ions would balance out the 2+ charge of the copper ion. Therefore, you need to specify the charge of the copper ion with a Roman numeral in parentheses following the name copper to reflect its oxidation state—copper(II).