2-pentanone

The numbering sequence is shown below:

1-phenyl-2-propanone

The numbering sequence is shown below; remember that the ketone is the highest priority group and defines the parent chain.

3-methylcyclopentanecarboxaldehyde

The numbering sequence is shown below; remember that an aldehyde group attached directly to a ring is named as a "carbaldehyde".

Nomenclature of Aldehydes & Ketones

For each of the compounds on the left, give the IUPAC name; pay particular attention to stereochemistry.

Click the mouse on the molecule to view the answer;

click on the button to view the parent chain and the correct numbering sequence.