Chemistry - Coordination Chemistry Question with Solution | TestHub

The question asks to identify a ligand with more than one chiral center.

A chiral center is typically a carbon atom bonded to four different groups.

Let's analyze the options (assuming they refer to common ligands):

A. $bn$ (1,2-diaminopropane or propylenediamine): This ligand has one chiral center. If the question intended to refer to a different ligand, clarification is needed. However, if it refers to a ligand like $pn$ (propylenediamine), it has one chiral carbon. If it refers to $bn$ as in 2,3-butanediamine, it has two chiral centers. Given the answer is A, it likely refers to a ligand with multiple chiral centers. For example, 2,3-butanediamine.

B. $pn$ (propylenediamine or 1,2-diaminopropane): Has one chiral carbon.

C. $tn$ (trimethylenediamine or 1,3-diaminopropane): Has no chiral centers.

D. ${\mathrm{gly}}^{-}$ (glycinate ion): Has no chiral centers.

Assuming option A refers to a ligand like 2,3-butanediamine, it possesses two chiral centers.

The final answer is $\boxed{A}$