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Question

In the complex Fe(CO)x, the value of x is:

A
3
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B
4
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C
5
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D
6
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Solution

The correct option is A 5
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=ZX+Y=(260+2x)

[Z= atomic number, X= oxidation state of metal, Y= total electrons donated by ligand]
x=5

So, the formula will be Fe(CO)5.

Hence it exists in Fe(CO)5 form.

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