Alcohols, Phenols and Ethers · Class 12 · CBSE · Science Chemistry
What is the correct order of boiling points for the isomeric pentanols: pentan-1-ol (I), 2-methylbutan-2-ol (II), and 3-methylbutan-1-ol (III)?
Practice question from Alcohols, Phenols and Ethers (Class 12 · CBSE · Science Chemistry), with the correct answer and a step-by-step solution.
medium · MCQ · Q-441506
What is the correct order of boiling points for the isomeric pentanols: pentan-1-ol (I), 2-methylbutan-2-ol (II), and 3-methylbutan-1-ol (III)?
- A.I > III > IICorrect answer
- B.II > III > I
- C.I > II > III
- D.III > I > II
Solution
Boiling points of alcohols decrease with branching due to a decrease in surface area and van der Waals forces. Straight-chain pentan-1-ol (I) has the highest boiling point, followed by 3-methylbutan-1-ol (III, primary alcohol with less branching), and 2-methylbutan-2-ol (II, tertiary alcohol with maximum branching) has the lowest.
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