Copper is diamagnetic material, but copper chloride is

CuCl- cuprous chloride, here Cu is in +1 state so according to configuration of cu no

  unpaired electron will be left as 4s of Cu contain only 1 electron and 3d10 is intact so it is

    diamagnetic.

            $CuC{l}_2$-cupric chloride, copper dichloride, copper bichloride, copper (2) chloride, here cu is in +2 state so in addition to 4s electron 1 electron from 3d also need to be removed, leaving 3d9  behind which has 1 unpaired electron so it is paramagnetic in nature