Question:
In gas phase, the H–O–O–H dihedral bond angle in H\(_2\)O\(_2\) is
In gas phase, the H–O–O–H dihedral bond angle in H\(_2\)O\(_2\) is
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H\(_2\)O\(_2\) is non-planar due to lone pair repulsion, unlike H\(_2\)O.
Updated On: Feb 11, 2026
- 145.8°
- 111.5°
- 90.2°
- 147.5°
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The Correct Option is B
Solution and Explanation
Step 1: Recall the structure of hydrogen peroxide.
Hydrogen peroxide is a non-planar molecule due to lone pair–lone pair repulsions on oxygen atoms.
Step 2: Consider gas phase geometry.
In gas phase, repulsions are maximum, leading to a skewed (open book) structure.
Step 3: Known experimental value.
The experimentally determined dihedral angle (H–O–O–H) in gas phase is approximately 111.5°.
Step 4: Conclusion.
The correct dihedral angle is 111.5°.
Hydrogen peroxide is a non-planar molecule due to lone pair–lone pair repulsions on oxygen atoms.
Step 2: Consider gas phase geometry.
In gas phase, repulsions are maximum, leading to a skewed (open book) structure.
Step 3: Known experimental value.
The experimentally determined dihedral angle (H–O–O–H) in gas phase is approximately 111.5°.
Step 4: Conclusion.
The correct dihedral angle is 111.5°.
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