Chemistry - Coordination Chemistry Question with Solution | TestHub

(A) is correct: The complex contains three peripheral Co atoms, each coordinated by 4 NH₃ ligands, giving a total of $3\times 4=12$ Co-N bonds.

(B) is correct: Each of the two Co atoms has 4 NH₃ ligands (8 bonds), and the bridging $\mu$-NH₂ group adds 2 more Co-N bonds, totaling 10.

(C) is incorrect: The iron center binds to one acetyl carbon and two carbonyl carbons, resulting in 3 Fe-C bonds instead of 2.

(D) is incorrect: The prefix "-N,O" specifies that EDTA acts as a bidentate ligand here, forming only 1 chelate ring instead of 5.