JEE Main · 2023 · 29 Jan 2023 · Shift 1 · Coordination Compounds

A complex is chiral when it has neither a plane nor a centre of symmetry, so that it and its mirror image cannot be superimposed. The square-planar $\text{cis-}[\mathrm{PtC}{\mathrm{l}}_2(\mathrm{N}{\mathrm{H}}_3{)}_2]$ and the trans octahedral species each possess a plane of symmetry and are achiral. In $\text{cis-}[\mathrm{PtC}{\mathrm{l}}_2(\mathrm{en}{)}_2{]}^{2+}$ the two chelating ethylenediamine rings and the two cis chlorides wrap round the metal in a propeller-like arrangement that has no plane or centre of symmetry, so it exists as a pair of non-superimposable enantiomers. The chiral complex is $\text{cis-}[\mathrm{PtC}{\mathrm{l}}_2(\mathrm{en}{)}_2{]}^{2+}$.