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

Options

A. Total number of valence shell electrons at metal centre in `Fe(CO)_(5)` or `Ni(CO)_(4)` is 16
B. These are predominantly low spin in nature
C. Metal-carbon bond strengthens when the oxidationary state of the metal is lowered
D. The carbonyl C-O bond weakens when the oxidation state of the metal is increased .

Answer

b,c

Explanation

(b,c) Fe`(CO)_5` total no of valence electrons = 18 low spin complex ltBrgt `Ni(CO)_4` : Total no. Of valence electrons = 18 low spin complex,
Metal-carbonyl(C-O) bond is stronger is case of increased oxidation state of metal.