(A) The complex ion [Co(CN)₄]^2– is paramagnetic with three unpaired electrons. Use ideas from the crystal field theory to speculate on its probable structure.

(B) Would you expect [Cu(NH₃)₄]²⁺ to be diamagnetic or paramagnetic? Can you use this information about the magnetic properties of [Cu(NH₃)₄]²⁺ to help you determine whether the structure of [Cu(NH₃)₄]²⁺ is tetrahedral or square-planar? Explain.