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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Effective atomic number of $Co(CO)_4$ is $35$, hence it is less stable. It attains stability by
  • A
    Oxidation of $Co$
  • B
    Reduction of $Co$
  • C
    Dimerization
  • ✓
    Both $(B)$ and  $(C)$
✓

Answer

Correct option: D.
Both $(B)$ and  $(C)$
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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