Chemistry Transition Elements DUHS 2024
PMDC Verified Question 9 of 68
An example of a bidentate ligand among the following is:
A
\( Br^{-} \)
B
\( C_{2}O_{4}^{2-} \)
C
\( CN^{-} \)
D
\( OH^{-} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( C_{2}O_{4}^{2-} \)
Concept:

A bidentate ligand is a molecule or ion that has two separate donor atoms, allowing it to bind to a single metal center twice simultaneously, forming a chelate ring.

Solution:

  • Option B (\(C_2O_4^{2-}\)): This is the oxalate ion. It has two negatively charged oxygen atoms at opposite ends of the molecule, both of which can independently donate a lone pair to a central metal. Therefore, it is definitively bidentate.


Why other options are incorrect:

  • \(Br^-\), \(CN^-\), \(OH^-\): These are all classic monodentate ligands. They only attach to a central metal ion at a single binding site.

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