Chemistry Transition Elements BUMHS 2023
PMDC Verified Question 24 of 68
Which of the following is a bidentate ligand?
A
Ammine
B
Hydrazine
C
Aqua
D
Carbonyl
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Hydrazine
Concept:

A bidentate ligand is a molecule or ion that has two donor atoms, allowing it to bind to a central metal ion at two points simultaneously.

Solution:

  • Hydrazine (\(H_2\ddot{N}-\ddot{N}H_2\)) contains two adjacent nitrogen atoms, each with a lone pair of electrons.


  • According to the source textbook's specific curriculum rules, it is classified as a bidentate ligand because of these two potential donor sites. (Note: In advanced structural chemistry, it acts as a bridging bidentate ligand between two different metals to avoid 3-membered ring strain, but for this level of test prep, it is simply identified as bidentate).


Why other options are incorrect:

  • Ammine (\(NH_3\)): Monodentate (1 lone pair on N).


  • Aqua (\(H_2O\)): Monodentate (O has 2 lone pairs but only uses 1 for bonding to a single metal due to geometry).


  • Carbonyl (\(CO\)): Monodentate (binds via Carbon).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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