Vsepr & Hybridisation
Which statement about hydrogen bonding is correct?
Select the correct option:
Solution
Requires H attached to a highly electronegative atom (N, O, F)
- Nature of H-Bonding: It is a strong dipole-dipole attraction (not a formal covalent bond).
- Conditions:
- Hydrogen must be covalently bonded to a small, highly electronegative atom (F, O, or N).
- An electronegative atom (F, O, N) with a lone pair must be nearby.
- Why only F, O, N?: Their high electronegativity creates a large partial positive charge on H, and their small size allows the atoms to get close enough for strong interaction.
- Effects: Significantly raises boiling points (e.g., H2O vs H2S) and increases solubility in polar solvents.
- Strength: It is much weaker than covalent bonds but stronger than normal van der Waals forces.
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About This Question
- Subject
- chemistry
- Chapter
- chemical bonding and molecular structure
- Topic
- vsepr & hybridisation
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Requires H attached to a highly electronegative atom (N, O, F)
- Nature of H-Bonding: It is a strong dipole-dipole attraction (not a formal covalent bond).
- Conditions:
- Hydrogen must be covalently bonded to a small, highly electronegative atom (F, O, or N).
- An electronegative atom (F, O, N) with a lone pair must be nearby.
- Why only F, O, N?: Their high electronegativity creates a large partial positive charge on H, and their small size allows the atoms to get close enough for strong interaction.
- Effects: Significantly raises boiling points (e.g., H2O vs H2S) and increases solubility in polar solvents.
- Strength: It is much weaker than covalent bonds but stronger than normal van der Waals forces.
This easy difficulty chemistry question is from the chapter chemical bonding and molecular structure, covering the topic of vsepr & hybridisation. It appeared in the 2025 exam.
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