cannot connect two bones together i want to connect bone 1 and 2 together however i am not able parent any to the other

notice that bone 1 is not in the same group as of bone 2
, basically group "2" is a duplicate of group "1" with a rotation of 180 degrees about the z-axis 

thanks in advance.
In edit mode select the head only of bone 1, then press Shift S "Cursor to selected", then select the tail only of bone 2 and presse shift S "selection to cursor". Then select the bone 1, shift select the bone 2, and press Ctrl P "Connected". Different bone groups are not a problem because they are referred to pose mode, not edit mode.