Question:
Which among the following compounds has highest boiling point?
Which among the following compounds has highest boiling point?
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Within the same functional group family, count the carbon atoms. More carbons mean a higher molecular weight and a higher boiling point due to stronger dispersion forces.
Updated On: Jun 4, 2026
- Hexanal
- Propanal
- Ethanal
- Pentanal
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Question:
We need to identify the aldehyde with the highest boiling point among the given homologous series options.
Step 2: Detailed Explanation:
For a homologous series like aldehydes, boiling point increases steadily with molecular mass. This is due to the strengthening of intermolecular van der Waals dispersion forces from larger electron clouds.
Comparing the carbon chain lengths: Ethanal (2 carbons), Propanal (3 carbons), Pentanal (5 carbons), and Hexanal (6 carbons).
Because hexanal possesses the longest carbon chain and highest molecular mass, it exhibits the strongest intermolecular forces, requiring the most thermal energy to boil.
Step 3: Final Answer:
The compound with the highest boiling point is hexanal, corresponding to option (A).
We need to identify the aldehyde with the highest boiling point among the given homologous series options.
Step 2: Detailed Explanation:
For a homologous series like aldehydes, boiling point increases steadily with molecular mass. This is due to the strengthening of intermolecular van der Waals dispersion forces from larger electron clouds.
Comparing the carbon chain lengths: Ethanal (2 carbons), Propanal (3 carbons), Pentanal (5 carbons), and Hexanal (6 carbons).
Because hexanal possesses the longest carbon chain and highest molecular mass, it exhibits the strongest intermolecular forces, requiring the most thermal energy to boil.
Step 3: Final Answer:
The compound with the highest boiling point is hexanal, corresponding to option (A).
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