1. Explain why both cis and trans isomers are possible for [Co(NH3)2(C2O4)2] but only the cis isomer is possible for [Co(NH3)4(C2O4)]+. You may want to try constructing a trans isomer of the second complex before answering this question. 2. Is more than one geometric isomer possible for the complex [Co(NH3)5Cl]2+ ion? Why or why not? If your answer is yes, provide a sketch of both isomers. 3. How many total isomers are possible for the compound [Co(C2O4)2(NH3)Cl]2 ? Make sketches of these isomers. Indicate optical isomers and draw them as mirror images