1.

Which of the following complex will show optical activity?

Answer»

(a) `trans-[CO(NH_3)_4Cl_2]^(+)`
(b) `[Cr(H_2O)]^(3+)`
(c) `cis-[Co(NH_3)_2(EN)_2]^(3+)`
(d) `trans-[Co(NH_3)_2(en)_2]^(3+)`

Solution :(a) trans-`[Co(NH_3)_4Cl_2]^(+)` has plane of symmetry as well as CENTRE of symmetry. Hence it does not show OPTICAL isomerism.
(b) `[Cr(H_2O)_6]^(3+)` has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism. ltbr. (c) cis-`[Co(NH_3)_2(en)_2]^(3+)` LACKS one of the symmetry elements.

(d) trans-`[Co(NH_3)_2(en)_2]^(3+)` has plane of symmetry as well as centre of symmetry. Hence it does not show optical isomerism.


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