Question

Oxidation state of $Fe$ in $Fe ( CO )_{5}$ is zero. $EAN$ 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)

If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:

Answer 2

$CO$ 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.