Question:
Which of the following isomeric amines has the highest boiling point?
Which of the following isomeric amines has the highest boiling point?
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Boiling point:
Primary > Secondary > Tertiary
Less branching $\rightarrow$ Higher boiling point
Less branching $\rightarrow$ Higher boiling point
Updated On: May 8, 2026
- tert-Butylamine
- Ethyldimethylamine
- Diethylamine
- n-Butylamine
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept: Boiling point depends on:
• Hydrogen bonding
• Surface area (branching decreases boiling point)
Step 1: Compare types.
• Primary amines $\rightarrow$ strong H-bonding
• Secondary $\rightarrow$ less
• Tertiary $\rightarrow$ least
Step 2: Analyze options.
• (A) tert-Butylamine: Primary but highly branched
• (B) Ethyldimethylamine: Tertiary
• (C) Diethylamine: Secondary
• (D) n-Butylamine: Primary and unbranched (max surface area)
Step 3: Conclusion.
Thus, n-butylamine has highest boiling point. Final Answer: Option (D)
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