Volatility of aldehydes and ketones

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SUMMARY

Aldehydes exhibit higher volatility than ketones primarily due to their molecular structure. While both functional groups contain a carbonyl (C=O) group, aldehydes have one less inductive effect compared to ketones, which possess two electron-donating groups that stabilize the carbonyl. This difference in electron distribution leads to a slight variation in dipole-dipole interactions, ultimately affecting volatility. The discussion also hints at the relevance of keto-enol tautomerism in understanding these properties.

PREREQUISITES
  • Understanding of molecular polarity and dipole-dipole interactions
  • Familiarity with functional groups, specifically aldehydes and ketones
  • Knowledge of inductive effects in organic chemistry
  • Basic concepts of keto-enol tautomerism
NEXT STEPS
  • Research the differences in volatility between aldehydes and ketones in detail
  • Explore the concept of inductive effects in organic compounds
  • Study keto-enol tautomerism and its implications in organic chemistry
  • Investigate the role of intermolecular forces in determining boiling points
USEFUL FOR

Chemistry students, organic chemists, and anyone interested in the physical properties of organic compounds, particularly those studying the volatility of functional groups.

RCB
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Homework Statement



why aldehydes more volatile than ketones

Homework Equations


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The Attempt at a Solution


I would have presumed that as BOTH contain the same C=O group the overall polarity of the molecule would be the same. hence the strength of the dipole forces should be the same
As they have the same no. of electrons so London forces are the same

their surface area's are the same so there should be no difference in surface contact??

what causes the slight difference (It is only a slight difference!)
 
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For a moment you had me worried - I didn't realize they were.

But as you say, only slightly, so that's OK. :biggrin:

I guess in a ketone there are two inductive pushes to polarise the C=O and just one in an aldehyde. You could also think about these factors in connection with a possible role of keto-enol tautomerism, I do not actually know the answer but that could start you looking into things.
 
ye I figured.
given you didn't know it happened how could you know why
never mind!
 

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