The metal complexes X and Y are :- [where η 1 ⇒ σ-donor ligand & η 2-6 ⇒ π-donor ligand]

Chemistry - Coordination Chemistry Question with Solution | TestHub

ChemistryCoordination ChemistryWerner theory + calculation of EANMedium2 minQB

ChemistryMediumsingle choice

Passage / Comprehension

For the following reactions, metal complexes 'X' and 'Y' are formed and follow EAN rule $Ni (s) CO (g) 1 atm / (330 - 350 K)^{'} X^{'}$

$FeCl_{2} 2 NaC_{5} H_{5}^{'} Y$ '

The metal complexes X and Y are :-

[where η¹ ⇒ σ-donor ligand & η^2-6 ⇒ π-donor ligand]

Options:

Answer:

Solution:

The correct option is A.

For complex X, Ni(CO)₄, nickel is in the 0 oxidation state and CO is a $σ$ -donor and $π$ -acceptor ligand. This complex obeys the 18-electron rule.

For complex Y, Fe( $η^{5}$ -C₅H₅)₂, known as ferrocene, iron is in the +2 oxidation state. The cyclopentadienyl ligand (C₅H₅⁻) acts as a $η^{5}$ -ligand, donating 5 electrons. This complex also obeys the 18-electron rule.

Stream:JEESubject:ChemistryTopic:Coordination ChemistrySubtopic:Werner theory + calculation of EAN

⏱ 2mℹ️ Source: QB

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