Final answer:
The correct name for the compound is 3-methyl-2-pentene.
Step-by-step explanation:
The chemical name "3-methyl-2-pentene" describes a hydrocarbon compound belonging to the alkene class. Let's break down the name to understand its structure:
Pentene: This indicates that the hydrocarbon has five carbon atoms in its main chain. The suffix "-ene" suggests that it is an alkene, which means it contains a double bond.
2: The "2" indicates that the double bond is located on the second carbon atom in the main chain.
3-methyl: There is a methyl group (CH₃) attached to the third carbon atom of the main chain.
b. The longest chain containing the double bond has five carbon atoms, so the parent compound is a pentene (rule 1). To give the first carbon atom of the double bond the lowest number (rule 2), we number from the left, so the compound is a 2-pentene.
There is a methyl group on the third carbon atom (rule 3), so the compound's name is 3-methyl-2-pentene.