1.

Which one of the following complexes shows optical isomerism ?

Answer»

`[Co(NH_(3))_(3)Cl_(3)]`
`[Co(en_(2))Cl_(2)]Cl`
trans `[Co(en_(2))Cl_(2)]Cl`
`[Co(NH_(3))_(4)Cl_(2)]Cl` (en = ethylenediamine)

Solution :`[Co(NH_(3))_(3)Cl_(3)]` has two GEOMETRICAL isomers but both are OPTICALLY inactive due to PLANE of symmetry.
CIS `[Co(en)_(2)Cl_(2)]Cl` is optically active.
trans `[Co(en)_(2)Cl_(2)]Cl` is optically inactive due to plane of symmetry.
`[Co(NH_(3))_(4)Cl_(2)]Cl` has two geometrical isomers but both are optically inactive due to plane of symmetry.


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