Question

Assertion Oxidation state of $Fe$ in $Fe ( CO )_{5}$ is zero.
Reason $EAN$ of $Fe$ in this complex is $36$.

• A. If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
• B. If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
• C. If Assertion: is true but Reason: is false
• D. If both Assertion: and Reason: are false

Answer 1

Answer: (B)

$CO$ is a neutral ligand, thus oxidation state of $Fe$ in $Fe ( CO )_{5}$ is $0$.
$EAN$ of $Fe$
$=$ electrons of $Fe +2 \times$ electrons of ligands
$=26+2 \times 5$
$=36$
Hence, Reason is true but not correct explanation for Assertion.