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The relatively high boiling points of alkanols are due to…

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The relatively high boiling points of alkanols are due to

A. ionic bonding

B. aromatic character

C. covalent bonding

D. hydrogen bonding




Hydrogen bonding is chiefly responsible for the higher boiling points of alkanols when compared to alkanes, aldehydes or ketones of equal carbon.

Alkanol molecules permit hydrogen bond to form in the OH functional group, but such hydrogen bond is not present in equivalent alkanes with equal number of carbon.

Now for the right answer to the above question:

  1. Option A is incorrect. ionic bond, not present in alkanols.
  2. Option B is incorrect. alkanols have no aromatic character.
  3. C is incorrect. covalent bonding is also present in alkanes of equal number of carbons, but the presence of additional hydrogen bond in alkanols makes the difference.
  4. D is the correct answer. Hydrogen bond is the chief culprit here.


You may please note these/this:

  • All organic compounds have covalent bonds, but compounds with special hydrogen bonds become comparatively higher in boiling point.

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/ culled from 2015 JAMB-UTME Chemistry past question 19 /

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