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Question:

Which one of the following has an optical isomer?

[Co(en)3]3+

[Zn(en)(NH3)2]2+

[Co(H2O)4(en)]3+

[Zn(en)2]2+(en=ethylenediamine)

Solution:

[Co(en)3]3+ is optically active and will give rise to optical isomers. Six co-ordinate complexes containing three identical bidenate ligands, such as Co(en)33+ or Co(Ox)3 are optically active.