The correct IUPAC name of the following compound is

4-Bromo-3-methylpent-2-ene

The correct answer is Option (4) → 4-Bromo-3-methylpent-2-ene

First, identify the longest carbon chain containing the double bond.

• The longest chain has 5 carbon atoms → pentene
• The double bond is between C-2 and C-3 → pent-2-ene
• Substituents:
• A methyl (–CH₃) group on C-3
• A bromo (–Br) group on C-4

Arranging substituents alphabetically: 4-Bromo-3-methylpent-2-ene