3. (a) Draw 2 optical isomers for the compound whose formula is [Co(en)2B12]NO; (b) Draw 2 geometric isomers for the species whose formula is [Ni(dien)(H;O);]* 2+

3. (a) Draw 2 optical isomers for the compound whose formula is [Coen), Brz]NO, (b) Draw 2 geometric isomers for the species whose formula is [Ni(dien)(H,0),72