Which of the following complexes can exist as enantiomers? Draw their structures
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No ; Yes ; Yes ; Yes ; (e) Yes ; (f) No.
Sol. cis–[Co(NH 3 ) 4 Br 2 ] + does not show optical isomerism as there is plane of symmetry and centre of symmetry in the molecule.
cis–[Cr(H 2 O) 2 (en) 2 ] 3+ show optical isomerism as shown below because of the absence of plane of symmetry as well as centre of symmetry.
Glycine is NH 2 CH 2 COOH in which the donor atoms are nitrogen and oxygen. Hence the ligand is called as unsymmetrical ligand i.e. AB type. The complex, [Cr(gly) 3 ] has two enantiomeric forms as given below.
[Cr(en) 3 ] 3+ : 
(e) cis–[Co(NH 3 )Cl(en) 2 ] 2+ : 
trans–[Co(NH 3 ) 2 (en) 2 ] 2+ has plane of symmetry as well as centre of symmetry. So, no optical isomerism is observed.
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