Concept:
IUPAC naming rules:
• Choose longest carbon chain
• Number to give lowest locants
• Arrange substituents alphabetically Step 1: Find the longest chain.
The longest continuous carbon chain contains 8 carbons → octane. Step 2: Number the chain.
Number from the end that gives the lowest locants to substituents.
Methyl at C-3, ethyl at C-4 (not C-6 and C-5). Step 3: Arrange substituents alphabetically.
Ethyl comes before methyl.
