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STD 12 - 5. Co-ordination chemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 5. Co-ordination chemistry4 Marks
MCQ
The $EAN$ of $Fe$ in $K_4[Fe(CN)_6]$ is
  • A
    $35$
  • B
    $37$
  • ✓
    $38$
  • D
    $36$
✓

Answer

Correct option: C.
$38$
c
Complex carbonyls follow Sidwick's EAN rule i.e compound with $EAN\,\,36$ will be relatively more stable than other metal carbonyls.

Iron pentacarbonyl has $EAN$ number of $36= Z - X + Y =(26-0+2 x )$

[ $Z =$ atomic number, $X =$ oxidation state of metal, $Y =$ total electrons donated by ligand]

$\therefore x =5$

So, the formula will be $Fe ( CO )_5$.

Hence it exists in $Fe ( CO )_5$ form.

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