Question

$[ \text{Mn}_2(\text{CO})_{10} ]$ and $[ \text{Co}_2(\text{CO})_8 ]$ structures have:A. Metal-Metal linkage
B. Terminal CO groups
C. Bridging CO groups
D. Metal in zero oxidation stateChoose the correct answer from the options given below:

• A. Only A, B, C
• B. Only B, C, D
• C. Only A, C, D
• D. Only A, B, D

Answer 1

Answer: (D)

Only A, B, D

Answer 2

Mn$_2$(CO)$_{10}$ has a structure with a direct Mn-Mn single bond , ten terminal CO groups, and no bridging CO groups. Each Mn is in a zero oxidation state.
Co$_2$(CO)$_8$ has a more complex structure. It can exist in different isomeric forms. The most common structure involves bridging CO groups and a Co-Co bond. In another form, there are only terminal CO ligands and aCo-Co bond. In either isomeric form, Co$_2$(CO)$_8$ features a metal-metal bond , terminal CO groups, and can have bridging CO groups. Each Co atom is also in the zero oxidation state.
So, the common features are Metal-Metal linkage (A), Terminal CO groups (B), and Metal in zero oxidation state (D).