Which of the following have geometric isomers ?

Question

a) [Co(H2O)4Cl2] +


b) [Co(H2O)3Cl3]


c) [Co(en)2(NH3)Br] 2+


d) [Pt(NH3)Cl3] −

Answer 1

a) The Cl's will be cis (adjoining one another on an edge of an octahedron) or trans (on opposite vertices of the octahedron).

c) Not only will there be geometrical isomers, with en on opposite edges of the octahedron (trans), but there will also be enantiomers with en's on the same face (cis), and NH3 and Br such that the two enantiomers will be nonsuperimposable mirror images.

Answer 2

abc