Question:
Which from following compounds has highest boiling point?
Which from following compounds has highest boiling point?
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In a homologous series, boiling point rises with molecular mass because van der Waals forces increase.
Updated On: Nov 13, 2026
- Acetaldehyde
- Propionaldehyde
- Butyraldehyde
Valeraldehyde
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Aldehydes are polar but cannot form hydrogen bonds with each other. Their boiling points depend on dipole attraction and van der Waals forces.
Step 2: Trend in the series
As the carbon chain gets longer, molecular size and surface area increase, so dispersion forces increase.
Step 3: Compare the options
Acetaldehyde has 2 carbons, propionaldehyde 3, butyraldehyde 4 and valeraldehyde 5. Valeraldehyde is the largest, so it has the highest boiling point.
Final Answer:
Valeraldehyde has the highest boiling point. \[ \boxed{\text{(D) }\text{Valeraldehyde}} \]
Aldehydes are polar but cannot form hydrogen bonds with each other. Their boiling points depend on dipole attraction and van der Waals forces.
Step 2: Trend in the series
As the carbon chain gets longer, molecular size and surface area increase, so dispersion forces increase.
Step 3: Compare the options
Acetaldehyde has 2 carbons, propionaldehyde 3, butyraldehyde 4 and valeraldehyde 5. Valeraldehyde is the largest, so it has the highest boiling point.
Final Answer:
Valeraldehyde has the highest boiling point. \[ \boxed{\text{(D) }\text{Valeraldehyde}} \]
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