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Alcohols, Phenols, and Ethers — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryAlcohols, Phenols, and Ethers1 Mark
MCQ
Select the correct order of boiling point:
  • A
    diethyl ether > n-butyl alcohol > n-butaraldehyde > n-pentane.
  • B
    n-butyl alcohol > n-butaraldehyde > n-pentane > diethylether.
  • C
    n-pentane > n-butaraldehyde > n-butyl alcohol > diethylether.
  • D
    n-butyl alcohol > n-butaraldehyde > diethylether > n-pentane.
✓

Answer

  1. n-butyl alcohol > n-butaraldehyde > n-pentane > diethylether.

Explanation:

As we know that the higher the extent of intermolecular Hydrogen bonding in a molecule, the higher its boiling point becomes.

By that logic, n-butyl alcohol will have a higher boiling point than n-butyraldehyde due to the presence of more extensive H-bonding.

Again, there is no H-bonding present in both diethyl ether and n-pentane. But as n-pentane has a higher molecular weight than that of diethyl ether, it will possess a higher boiling point.

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