1. The structures of four complex ions (W,X,Y, and Z) are shown below:
determine which, if any, of these complex ions are (i) geometric isomers, (ii) optical isomers, (iii) identical, or (iv) not related to any of the others as an isomer.
2. Draw the structures of the four geometrical isomers of [Co(NH3)2(en)BrCl]^+. Two of these are optically active. Identify these, and draw the structures of their optical isomers.