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. dimerisation.
• D. both (b) and (c).

Answer 1

The correct option is D both (b) and (c).

The EAN of $Co(CO{)}_4$ is 35. It will acquire stability when its EAN will become 36. This is possible when it gains one electron.
It can be done either by reduction or by dimerization.