Name the following compound.

• A. 3-fluoro-1-ethylpentane
• B. 3-fluoro-1-ethylcyclopentane
• C. 1-ethyl-3-fluorocyclopentane
• D. 1-ethyl-4-fluorocyclpentane

Answer: (C)

Verified step by step guidance

1. Identify the parent structure in the compound. Here, the main ring is a cyclopentane, which is a five-membered carbon ring.
2. Locate and name the substituents attached to the cyclopentane ring. In this structure, there is an ethyl group (–CH2CH3) and a fluorine atom (–F) attached to the ring.
3. Number the cyclopentane ring to give the substituents the lowest possible numbers. Start numbering at the carbon with the ethyl group as carbon 1, then number around the ring to assign the fluorine the lowest possible number.
4. Assign the positions of the substituents based on the numbering. The ethyl group is at carbon 1, and the fluorine is at carbon 3.
5. Combine the substituent names and their positions with the parent name to form the full name: 1-ethyl-3-fluorocyclopentane.