What is the IUPAC name of the following compound?
Z)-3-ethyl-5-methyl-1,4-heptadiene
E)-3-ethyl-5-methyl-1,4-heptadiene
E)-3-methyl-5-vinyl-3-heptene
Z)-1,3-diethyl-1-methyl-1,4-pentadiene

Question

What is the IUPAC name of the following compound? 
Z)-3-ethyl-5-methyl-1,4-heptadiene 
E)-3-ethyl-5-methyl-1,4-heptadiene 
E)-3-methyl-5-vinyl-3-heptene 
Z)-1,3-diethyl-1-methyl-1,4-pentadiene

Quizplus · Accepted Answer

The compound has two double bonds, and according to the IUPAC rules, the first double bond must be numbered as the lowest possible number. Thus, the chain is numbered from the left, giving the substituents at position 3 and 5. The stereochemistry of the double bond at position 3 is E, as the two higher priority substituents (ethyl and vinyl groups) are on opposite sides of the double bond. Therefore, the correct IUPAC name is (E)-3-ethyl-5-methyl-1,4-heptadiene.

What Is the IUPAC Name of the Following Compound