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Which of the compound show optical isomerism ? 1.cis-[Co(NH_(3))_(4)Cl_(2)]^(+) ""2.trans-[Co(en)_(2)Cl_(2)]^(+) 3. cis-[Co(en)_(2)Cl_(2)]^(+)"" 4.[Co(en)_(3)]^(3+) Select the correct answer using the codes given below:

Answer»

1 and 2
2 and 3
3 and 4
1,3 and 4

Solution :(1) `cis-[Co(NH_(3))_(4)Cl_(2)]^(+)` has plane of symmetry as well as centre of symmetry , so OPTICALLY inactive.
(2) `trans-[Co(en)_(2)Cl_(2)]^(+)` has plane of symmetry as well as centre of symmetry , so optically inactive.
(3 ) `cis-[co(en)_(2)Cl_(2)]^(+)` lacks plane of symmetry as well as centre of symmetry , so optically active.
(4) `[Co(en)_(3)]^(3+)` lacks AXIS of INTERNAL rotation, so optically active.


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