1. Tardigrade
  2. Question
  3. Chemistry
  4. Arrange the following compounds in increasing order of their boiling points CH 3 CHO , CH 3 CH 2 OH , CH 3 OCH 3, CH 3 CH 2 CH 3

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Q. Arrange the following compounds in increasing order of their boiling points $CH _{3} CHO , CH _{3} CH _{2} OH , CH _{3} OCH _{3}, CH _{3} CH _{2} CH _{3}$

AMUAMU 2009

Solution:

$CH _{3} CH _{2} OH$ has the highest boiling point among the given due to $H$-bonding. $CH _{3} OCH _{3}$ has higher molecular weight than $CH _{3} CH _{2} CH _{3}$ and thus, has the higher boiling point $CH _{3} CHO$.
$CH _{3} CHO$ has higher boiling point than alkane due to dipole-dipole interaction. Thus, the correct order of boiling point is
$CH _{3} CH _{2} CH _{3}< CH _{3} OCH _{3}< CH _{3} CHO < CH _{3} CH _{2} OH$