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Question:

Which of the following has an optical isomer?

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

[Co(NH3)3Cl]+

[Co(en)(NH3)2]2−

[Co(en)2(NH3)2]3+

Solution:

It is an octahedral complex of the type [M(AA)2X2], where AA is a bidentate ligand. Hence option D is correct.