Chemistry · Coordination Compounds

JEE Advanced 2018 — Paper 1 — Question 16

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are)

(Atomic numbers: $\mathrm{Fe}=26, \mathrm{Ni}=28$ )

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

Answer: B, C

Step-by-step solution

(a) Electronic configuration of central metal atom in both cases is $[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{6}$ ( 8 electrons in outermost

shell and 18 valence electrons respectively).

(b) Low spin complex because CO is a strong field ligand.

(d) The carbonyl $\mathrm{C}-\mathrm{O}$ bond becomes stronger when the oxidation state is increased.

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Exam: JEE Advanced 2018
Paper: Paper 1
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes

Answer: B, C

Step-by-step solution

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