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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
$EAN$ of central metal atom in $Fe_2(CO)_9$ will be
  • A
    $35$
  • B
    $36$
  • C
    $37$
  • ✓
    $33$
✓

Answer

Correct option: D.
$33$
d
$EAN$ value: $Co ( CO )_4, 27+8=35$, which is not equal to $36$ so to attain Sidgwicks's rule of $EAN$, it has to get one electron. So it gets stability by reduction of Co or by dimerization (after that $EAN$ value become 36 ).

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