Which of the following complex will show optical activity?
A
trans−[Co(NH3)4Cl2]+
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B
[Cr(H2O)6]3+
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C
cis−[Co(NH3)2(en)2]3+
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D
trans−[Co(NH3)2(en)2]3+
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Solution
The correct option is Ccis−[Co(NH3)2(en)2]3+ (1) trans-[Co(NH3)4Cl2]+ has plane of symmetry as well as centre of symmetry. Hence, it does not show optical isomerism.
(2)[Cr(H2O)6]3+ has plane of symmetry as well as centre of symmetry. Hence, it does not show optical isomerism. (3) cis−[Co(NH3)2(en)2]3+ lacks one of the symmetry elements. (4) trans−[Co(NH3)2(en)2]3+ has plane of symmetry as well as centre of symmetry. Hence, it does not show optical isomerism.