Provide the systematic name for the following ketone.

• A. 4,4-dichloro-2-hexanone
• B. 3,3-dichloro-2-hexanone
• C. 4,4-dichloro-5-hexanone
• D. 3,3-dichloro-5-hexanone

Answer: (B)

Verified step by step guidance

1. Identify the longest carbon chain that contains the ketone group. In this case, the longest chain has six carbon atoms, which corresponds to hexane.
2. Number the carbon chain starting from the end nearest to the ketone group to give the ketone the lowest possible number. The ketone group is on the second carbon, so it is named as 2-hexanone.
3. Identify and locate any substituents on the carbon chain. Here, there are two chlorine atoms attached to the third carbon.
4. Name the substituents and their positions on the chain. The chlorine atoms are named as 'dichloro' and are located on the third carbon, so it is named as 3,3-dichloro.
5. Combine the substituent names and positions with the base name of the ketone to form the systematic name: 3,3-dichloro-2-hexanone.