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Making the world better, one answer at a time. Propanone and propanal are soluble in water because they have polar functional groups. In propanone, the ketone functional group is polar.Water is also polar, and therefore will dissolve propanone. In propanal, the aldehyde functional group is polar.aking the world better, one answer at a time. Propanone and propanal are soluble in water because they have polar functional groups. In propanone, the ketone functional group is polar.
Propanal=Yes.. up to 20g/100ml http://en.wikipedia.org/wiki/Propanal Cyclohexanone=Slightly soluble: http://en.wikipedia.org/wiki/Cyclohexanone Benzaldehyde=Yes but not much..0.6g/100ml http://en.wikipedia.org/wiki/Benzaldehyde Long Live Wikipedia.es, polarity does play a role but for these examples Whether or not something is soluble is down to how much the molecule would prefer to interact with water compared to itself. Keep in mind that the larger a molecule the stronger the van der waals forces between itself and other molecules.