Question:
What is O-O bond length in ozone ?
What is O-O bond length in ozone ?
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Both O-O bonds in ozone are equal because of resonance, and measure 128 pm.
Updated On: Oct 1, 2026
- \(178\) pm
- \(128\) pm
- \(256\) pm
- \(483\) pm
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Ozone is a bent molecule with two resonance forms. Each O-O bond has a character between a single and a double bond, so the two bonds are identical.
Step 2: Compare with reference lengths:
A typical O-O single bond (as in \(\text{H}_2\text{O}_2\)) is about \(148\) pm. A typical O=O double bond (as in \(\text{O}_2\)) is about \(121\) pm.
Ozone lies between these two, at \(128\) pm, and the bond angle is about \(117^{\circ}\).
Step 3: Other options:
\(178\) pm, \(256\) pm and \(483\) pm are much longer than even a single O-O bond, so they cannot be bond lengths in ozone.
Final Answer:
The O-O bond length in ozone is \(128\) pm, option (B). \[ \boxed{128\ \text{pm}} \]
Ozone is a bent molecule with two resonance forms. Each O-O bond has a character between a single and a double bond, so the two bonds are identical.
Step 2: Compare with reference lengths:
A typical O-O single bond (as in \(\text{H}_2\text{O}_2\)) is about \(148\) pm. A typical O=O double bond (as in \(\text{O}_2\)) is about \(121\) pm.
Ozone lies between these two, at \(128\) pm, and the bond angle is about \(117^{\circ}\).
Step 3: Other options:
\(178\) pm, \(256\) pm and \(483\) pm are much longer than even a single O-O bond, so they cannot be bond lengths in ozone.
Final Answer:
The O-O bond length in ozone is \(128\) pm, option (B). \[ \boxed{128\ \text{pm}} \]
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