Question:
Which of the following compounds exhibits the highest boiling point due to hydrogen bonding?
Which of the following compounds exhibits the highest boiling point due to hydrogen bonding?
Show Hint
Strong hydrogen bonding occurs mainly when hydrogen is attached to:
\[
\text{F, O, or N}
\]
Compounds containing these bonds usually have unusually high boiling points.
Updated On: May 29, 2026
- \( \text{H}_2\text{O} \)
- \( \text{H}_2\text{S} \)
- \( \text{CH}_4 \)
- \( \text{HCl} \)
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The Correct Option is A
Solution and Explanation
Concept:
Hydrogen bonding is a strong intermolecular force that occurs when hydrogen is directly bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine. Stronger intermolecular forces result in higher boiling points.
Step 1: Identify which compound can form strong hydrogen bonds.
Among the given compounds:
• \( \text{H}_2\text{O} \): Oxygen is highly electronegative, so strong hydrogen bonding occurs.
• \( \text{H}_2\text{S} \): Sulfur is less electronegative; hydrogen bonding is negligible.
• \( \text{CH}_4 \): No hydrogen bonding possible.
• \( \text{HCl} \): Does not form significant hydrogen bonding.
Step 2: Relate hydrogen bonding to boiling point.
Water molecules are strongly associated through intermolecular hydrogen bonds, requiring large energy to separate them during boiling. Therefore, \( \text{H}_2\text{O} \) has the highest boiling point. \[ \boxed{\text{H}_2\text{O}} \]
Step 1: Identify which compound can form strong hydrogen bonds.
Among the given compounds:
• \( \text{H}_2\text{O} \): Oxygen is highly electronegative, so strong hydrogen bonding occurs.
• \( \text{H}_2\text{S} \): Sulfur is less electronegative; hydrogen bonding is negligible.
• \( \text{CH}_4 \): No hydrogen bonding possible.
• \( \text{HCl} \): Does not form significant hydrogen bonding.
Step 2: Relate hydrogen bonding to boiling point.
Water molecules are strongly associated through intermolecular hydrogen bonds, requiring large energy to separate them during boiling. Therefore, \( \text{H}_2\text{O} \) has the highest boiling point. \[ \boxed{\text{H}_2\text{O}} \]
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