What is the IUPAC name of the following compound?

1. $4-$Bromo$-3-$methylpent$-2-$ene
2. $3-$Bromo$-3-$methyl$-1, 2-$dimethylprop$-1-$ene
3. $2-$Bromo$-3-$methyl pent$-3-$ene
4. $3-$Bromo$-1, 2-$dimethylbut$-1-$ene

Asked in: JEE Main 2019 (10 Jan Shift 2)

Practice more Basic Principles of Organic Chemistry questions on Aicharya