Q15 / 150 · MHT CET 2026 (18 April Shift 1) · Chemistry

Find EAN of Fe in $\text{Fe(CO)}_5$

  • A
    $35$
  • Correct answer
    B
    $36$
  • C
    $26$
  • D
    $30$

Solution

The Effective Atomic Number (EAN) is calculated using the formula:

$\text{EAN} = Z - \text{Oxidation State} + 2 \times \text{Coordination Number}$

For $\text{Fe(CO)}_5$:

Atomic number of Fe ($Z$) = $26$

Oxidation state of Fe = $0$ (since CO is a neutral ligand)

Coordination number = $5$

$\text{EAN} = 26 - 0 + 2 \times 5$

$\text{EAN} = 26 + 10 = 36$

Hence, the correct answer is option: 'B'.

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