The correct statement(s) regarding the binary transition me…

Maths JEE - Advanced Previous Year Paper JEE-Advanced-2018-Paper-1 Single Correct MCQ

Published on: August 13, 2026

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

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

These are predominantly low spin in nature

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

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

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(b, c)

Electronic configuration of central metal atom in both cases is [Ar] 3d 10 4s 2 4p 6 (8 electrons in outermost shell and 18 valence electrons respectively).

Low spin complex because CO is a strong field ligand.

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

The carbonyl C - O bond becomes stronger when the oxidation state is increased.

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