IUPAC Name of CH3COCH3
The IUPAC name of CH3COCH3 is propanone, which is more commonly known as acetone. Acetone is a colorless, volatile liquid with a characteristic odor. It is widely used as a solvent in various industries and is also found in many household products.

Explanation

Prefix:
- The prefix "propan" indicates that the molecule contains three carbon atoms in a straight chain.

Suffix:
- The suffix "-one" indicates that the molecule contains a ketone functional group, where the carbonyl group (C=O) is located within the carbon chain.

Numbering:
- The carbonyl carbon is numbered as the lowest possible number in the chain, so the parent chain is numbered from the end closest to the carbonyl group.

Substituents:
- Since there are no substituents attached to the ketone group in this molecule, the name is simply propanone.
Therefore, the IUPAC name for CH3COCH3 is propanone or acetone.