The number of optical isomers possible for $\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ is ____.

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Coordination Compounds

The number of optical isomers possible for

[Cr (C_{2} O_{4})_{3}]^{3 -}

is ____.

Answer: 2

Solution

The complex

[Cr (C_{2} O_{4})_{3}]^{3 -}

is an octahedral complex with three bidentate oxalate ligands. This creates a chiral environment with no plane of symmetry. The complex exists as a pair of non-superimposable mirror images (enantiomers): the Δ (delta) and Λ (lambda) forms. Therefore, the number of optical isomers is 2.

JEE Main · 2021 · 27 Aug 2021 · Shift 2 · Integer answer

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