JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Coordination Compounds

Which of the following complex will show largest splitting of d-orbitals?

(A) $[Fe (C_{2} O_{4})_{3}]^{3 -}$
(B) $[FeF_{6}]^{3 -}$
(C) $[Fe (CN)_{6}]^{3 -}$ ✓ Correct
(D) $[Fe (NH_{3})_{6}]^{3 +}$

Answer: (C)

Solution

The magnitude of the crystal-field splitting is set mainly by the field strength of the ligand, as ordered in the spectrochemical series. For the common

F e^{3 +}

centre carrying oxalate, fluoride, cyanide or ammonia, cyanide is by far the strongest-field ligand while fluoride is the weakest. A stronger field pushes the

d

orbitals further apart, so the hexacyanidoferrate(III) ion shows the largest splitting of the

d

orbitals.

JEE Main · 2023 · 01 Feb 2023 · Shift 1 · Single correct option

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