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Number of complexes which show optical isomerism among the following is _________. cis - Cr ( ox ) 2 Cl 2 3 - , Co ( en ) 3 3 + , cis - Pt ( en ) 2 Cl 2 2 + , cis - Co ( en ) 2 Cl 2 + ​​​​​​​ , trans - Pt ( en ) 2 Cl 2 2 + , trans - Cr ( ox ) 2 Cl 2 3 -

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Pt ( en ) 2 Cl 2 2 + is a square planar complex forms geometrical isomers (cis and trans). Trans isomer does not show optical isomerism since it is symmetrical, while cis isomer shows optical isomerism as it is unsymmetrical. POS = plane of symmetry COS = centre of symmetry The compounds, cis − [ Co ( en ) 2 Cl 2 ] + and [ Co ( en ) 3 ] 3 + show optical isomerism as they do not possess any element of symmetry. cis - Cr ( ox ) 2 Cl 2 3 - → can show optical isomerism (no POS & COS) trans - Pt ( en ) 2 Cl 2 2 + → can'

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