What is the IUPAC name of the following compound?

E)-2-Bromo-3,4-dimethyl-2-pentene
Z)-1-Bromo-1,2,3-trimethyl-1-butene
Z)-2-Bromo-3,4-dimethyl-2-pentene
E)-1-Bromo-1,2,3-trimethyl-1-butene

Question

What is the IUPAC name of the following compound?

E)-2-Bromo-3,4-dimethyl-2-pentene 
Z)-1-Bromo-1,2,3-trimethyl-1-butene 
Z)-2-Bromo-3,4-dimethyl-2-pentene 
E)-1-Bromo-1,2,3-trimethyl-1-butene

Quizplus · Accepted Answer

The longest carbon chain in the compound is five carbons, and there is a double bond between the second and third carbon. The substituents on the double bond are a methyl group at the third carbon and a bromine atom at the second carbon. Since the methyl group and bromine are on opposite sides of the double bond, the compound is in the Z configuration. Therefore, the correct IUPAC name is (Z)-2-Bromo-3,4-dimethyl-2-pentene.

What Is the IUPAC Name of the Following Compound