Question #2975e

1 Answer
Kathryn Bell
Dec 21, 2017

They have the same molecular formula, but belong to different homologous series.

Explanation:

Functional group isomerism is an example of structural isomerism – where a molecule has the same molecular formula, but a different arrangement of atoms in space.

In functional group isomerism, the atoms are arranged as such that the isomers belong to different families (homologous series ) of molecules.

Acetone and propionaldehyde are examples of functional group isomers, because they have the same molecular formula C_3H_6O but belong to different homologous series.

Acetone is a ketone
![https://www.sigmaaldrich.com/site-level/http://product-restriction.html](https://useruploads.socratic.org/TL3nKDSomy1XlyAVYXAo_mfcd00008765-medium.png)
Propionaldehyde is an aldehyde
![https://www.sigmaaldrich.com/catalog/product/aldrich/p51451?lang=de&region=DE](useruploads.socratic.org)

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