Question:
Which among the following has highest boiling point?
Which among the following has highest boiling point?
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Straight chain > Branched chain (for same molecular formula).
Updated On: Jun 19, 2026
- Butan-1-ol
- 3-Methylbutan-1-ol
- Pentan-1-ol
- 2,2-Dimethylpropan-1-ol
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The Correct Option is C
Solution and Explanation
Step 1: Concept
Boiling point depends on molecular weight and the extent of branching.
Step 2: Meaning
Boiling point increases with molecular weight and decreases with branching.
Step 3: Analysis
- Butan-1-ol ($C_{4}$). - Pentan-1-ol, 3-Methylbutan-1-ol, and 2,2-Dimethylpropan-1-ol are all $C_{5}$ isomers. - Among $C_{5}$ isomers, Pentan-1-ol is a straight chain and has the highest surface area.
Step 4: Conclusion
Hence, Pentan-1-ol has the highest boiling point. Final Answer: (C)
Boiling point depends on molecular weight and the extent of branching.
Step 2: Meaning
Boiling point increases with molecular weight and decreases with branching.
Step 3: Analysis
- Butan-1-ol ($C_{4}$). - Pentan-1-ol, 3-Methylbutan-1-ol, and 2,2-Dimethylpropan-1-ol are all $C_{5}$ isomers. - Among $C_{5}$ isomers, Pentan-1-ol is a straight chain and has the highest surface area.
Step 4: Conclusion
Hence, Pentan-1-ol has the highest boiling point. Final Answer: (C)
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