Home Chemistry Co-ordinatios Compounds JEE ADVANCED Previous Year Question The correct statement(s) regarding the binar…
Chemistry Co-ordinatios Compounds JEE ADVANCED Previous Year Question Single Correct MCQ
Published on: August 12, 2026

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

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 oxidation state of the metal is lowered
D
The carbonyl C−O bond weakens when the oxidation state of the metal is increased

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(b,c) ⇒ Fe(CO) 5 : Total number of valence electrons is 18

: low spin complex.

⇒ Ni(CO) 4 : Total number of valence electrons is 18

: low spin complex

⇒ Metal-carbonyl bond strengthens when the oxidation state of metal is lowered.

⇒ The carbonyl C–O bond is stronger in case of increased oxidation state of metal.

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