The EAN of Fe in K_4[Fe(CN)_6] is - Vidyadip

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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