question_answer 21)

Draw the structures of optical isomers of (a) [Cr(C2O4)3]3–                                (b) [PtCl2(en)2]2+                     (c) [Cr(NH3)2Cl2(en)]+

Answer:

(a) Three isomers. (b) Cis and trans are geometrical isomers. Thus, three isomers are possible. (c) Three isomers Cis and trans are geometrical isomers Cis form is optically active as it has no plane of symmetry.               Trans isomer is optically inactive because of the presence of a plane of symmetry.