What is the systematic name for CuCl2?

The systematic name for CuCl2 is Copper(II) chloride because of the oxidation state of the copper ion in the compound. In this case, the copper ion has a charge of +2, which is indicated by the Roman numeral II in the name.

To derive this, we note that the compound is formed from the copper ion (Cu) and chloride ions (Cl). The chloride ion has a charge of -1. Since there are two chloride ions present, they collectively contribute a charge of -2. To balance this, the copper ion must have a +2 charge, leading to the designation Copper(II) for the systematic name.

This nomenclature practice helps specify which oxidation state of copper is involved, as copper can exhibit multiple oxidation states (specifically +1 and +2). Identifying the correct charge ensures clarity when communicating the specific substance, distinguishing it from Copper(I) chloride, which would correspond to CuCl. The other names provided in the choices do not adequately convey the required information about the oxidation state of copper in this context.