The correct statement(s) regarding the binary transition metal carbonyl compounds (are)
(atomic numbers: Fe=26, Ni=28)

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These are predominantly low spin in nature

The carbonyl C-O bond weakens when the oxidation state of the metal is increased.

Metal-carbon bond strengthens when the oxidation state of metal lowered.

Total number of valence shell electrons at metal center in Fe(CO)₅ or Ni(CO)₄ is 16

answer is B, C.

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Detailed Solution

(A) [Fe(CO)₅] & [Ni(CO)₄] complexes have 8-electrons in their valence shell (4th shell).

(B) Carbonyl complexes are predominantly low spin complexes due to strong ligand field.
(C) As electron density increases on metals (with lowering oxidation state on metals), the extent of synergic bonding increases. Hence M−C bond strength increases.
(D) While positive charge on metals increased and the extent of synergic bond decreases and hence C−O bond becomes stronger.

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