Chemistry Liquids MDCAT 2017
PMDC Verified Question 64 of 73
Which line in the following structure represents hydrogen bonding?

O H H O H H 1 2 3 4
A
1
B
2
C
3
D
4
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 2
Concept:

Hydrogen bonding is a special type of dipole-dipole attraction that occurs between a partially positive hydrogen atom and a highly electronegative atom (N, O, or F) possessing a lone pair.

Formula:

Not applicable.

Solution:

  • In diagrammatic representations, solid lines typically represent intramolecular covalent bonds, while dotted or dashed lines represent intermolecular hydrogen bonds.


  • Line "2" in the referenced past paper diagram correctly identifies the dotted attraction between the electropositive Hydrogen of one molecule and the electronegative atom of another.


Why other options are incorrect:

Other labeled lines point to standard covalent bonds within the molecule or are incorrectly placed between non-polar regions.

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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