JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Coordination Compounds

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The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is _____.
FeCl3 + KOH + H2C2O4 -> A

Answer: 2

Solution

With

KOH

and oxalic acid,

FeCl_{3}

gives potassium trioxalatoferrate(III),

K_{3} [Fe (C_{2} O_{4})_{3}]

. The ion

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

is octahedral with three identical bidentate oxalate ligands, a

[M(AA)_{3}]

type that is not superimposable on its mirror image. It therefore occurs as two enantiomers, the

Δ

and

Λ

forms, so the number of optical isomers is

2

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Integer answer

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