Which of the following is NOT a valid name for the given compound?

Step-by-step solution

The given compound is CH₃-CO-CH₃ . Let us evaluate the given names: 1. Propanone: This is the correct IUPAC name for a three-carbon ketone. 2. Dimethyl ketone: This is a valid common name, as there are two methyl groups attached to the carbonyl carbon. 3. Acetone: This is the widely accepted trivial name for this compound. 4. 2-Acetaldehyde: Acetaldehyde is an aldehyde with the formula CH₃CHO . The given compound is a ketone, not an aldehyde. Therefore, this name is invalid. Thus, 2-Acetaldehyde is not a valid name