Question:
Which of these have the least bond length (in pm)?
Which of these have the least bond length (in pm)?
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The bond length decreases as the atomic size decreases, and HF has the shortest bond length due to the small size of fluorine and hydrogen.
Updated On: Apr 18, 2026
- \( \text{O}_2 \)
- \( \text{Cl}_2 \)
- \( \text{Br}_2 \)
- HF
- \( \text{F}_2 \)
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The Correct Option is D
Solution and Explanation
The bond length of a molecule is influenced by the atomic size of the atoms involved in the bond. Generally, as the atomic size decreases, the bond length also decreases, provided the atoms are of the same period.
Step 1: Bond length comparison.
- \( \text{O}_2 \) has a bond length of approximately 121 pm.
- \( \text{Cl}_2 \) has a bond length of approximately 198 pm.
- \( \text{Br}_2 \) has a bond length of approximately 228 pm.
- HF has a bond length of approximately 92 pm, which is the shortest among the listed options. - \( \text{F}_2 \) has a bond length of approximately 142 pm.
Step 2: Conclusion.
Among the given options, HF (hydrogen fluoride) has the shortest bond length of about 92 pm, making it the correct answer.
Final Answer:} (D) HF
- \( \text{O}_2 \) has a bond length of approximately 121 pm.
- \( \text{Cl}_2 \) has a bond length of approximately 198 pm.
- \( \text{Br}_2 \) has a bond length of approximately 228 pm.
- HF has a bond length of approximately 92 pm, which is the shortest among the listed options. - \( \text{F}_2 \) has a bond length of approximately 142 pm.
Step 2: Conclusion.
Among the given options, HF (hydrogen fluoride) has the shortest bond length of about 92 pm, making it the correct answer.
Final Answer:} (D) HF
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