Question

An effective atomic number of $Co(CO{)}_4$ is $35$ and hence is less stable. It attains stability by

• A. Oxidation of $Co$
• B. Reduction of $Co$
• C. Dimerization
• D. Both (b) and (c)

Answer 1

The correct option is D Both (b) and (c)

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).