The reaction, $\left[(\mathrm{CO})_{5} \mathrm{Mn}(\mathrm{Me})\right]+\mathrm{CO} \rightarrow\left[(\mathrm{CO})_{5} \mathrm{Mn}\{\mathrm{C}(\mathrm{O}) \mathrm{Me}\}\right]$ is an example for
(a)oxidative addition
(b)electrophilic substitution
(c)nucleophilic substitution
(d)migratory insertion
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
The methyl group migrates onto an adjacent coordinated CO to give the acetyl ligand; the vacant site is then filled by external CO — CO migratory insertion.