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The structural formula of ethanoic acid is…

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The structural formula of ethanoic acid is

  • A. HCOOH
  • B. CH3COOH
  • C. CH3CH2CHO




In naming alkanoic acids, ensure that all the carbons, including the carbon in the functional group is counted.

Ethanoic acid will have a functional group of COOH, and a total of two carbons.

Now for the right answer to the above question:

  1. Option A is incorrect. there is only one carbon, this is called methanoic acid.
  2. Option B is correct. Two carbons.
  3. C is incorrect. this is three carbons, and an aldehyde functional group. This is propanal and not ethanoic acid.
  4. D is not the correct answer. This is three carbons and alkanoic acid functional group. The name of this compound is propanoic acid.


You may please note these/this:

  • You must have to count all the carbons including the one in the functional group and give a name according this number of carbons.

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/ culled from 2017 JAMB-UTME Chemistry question 34 /

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