Question #4310f

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P dilip_k · Stefan V.
Dec 5, 2016

http://alevelchem.com/aqa_a_level_chemistry/unit3.1/sub313/03.htm

https://sites.google.com/site/ellesmerealevelchemistry/module-2-foundations-in-chemistry

In ethanoic acid dimerisation occurs forming two H-bonds between two molecules making effective molar mass double as shown above.

In ethanol H-bond is also formed as shown above but dimerisation does not occur. So molecular association is less than that of ethanoic acid

In ethanal no #-OH# group is present. So there exists no H-bond between ethanal molecules.
Here the molecules are associated with less strong dipole-dipole attraction.

So their boiling points are in the following order

#CH_3CHO < CH_3CH_2OH < CH_3COOH#

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