What is the IUPAC name of the following compound?

Question

Quizplus · Accepted Answer

According to the IUPAC nomenclature rules, we first identify the longest carbon chain containing the functional group (in this case, the benzene ring). We number the carbons of the ring and then add the substituents in alphabetical order, assigning them the lowest possible numbers. In this case, the longest chain is a 4-carbon chain with a benzene ring attached to it. The benzene ring is numbered starting from the carbon that is closest to the point of attachment to the chain. The substituents are a chlorine atom at position 4, an ethyl group at position 1 and a propyl group at position 2. Since the ethyl group has the lowest number, we start with it in the name. The correct name is, therefore, 4-chloro-1-ethyl-2-propylbenzene.

What Is the IUPAC Name of the Following Compound