The correct statement(s) regarding the binary transition metal carbonyl compounds is (are)
(Atomic numbers: $F e = 26, N i = 28$ )

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These are predominantly low spin in nature

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

Total number of valence shell electrons at metal center in $F e {(C O)}_{5}$ or $N i {(C O)}_{4}$ is 16

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

answer is B, C.

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Detailed Solution

(a) $[(F e (C O_{5})] & [N i {(C O)}_{4}]$ complexes have 18- electrons in their valence shell. For transition elements of 3d-series, the valence shells are 3d- and 4s
(b) Due to strong ligand field, carbonyl complexes are predominantly low spin complexes.
(c) As electrons density increases in metals (with lower-ing oxidation state on metals), the extent of synergic bonding increases . Hence, M-C bond strength increases
(d) While positive charge on metals increases and the extent of synergic bond decreases and hence, C-O bond becomes stronger.