What is the proper IUPAC name for the following molecule:
A) (2E,4
Z)-2,4-heptadiene
B) (2E,3
Z)-2,3-heptadiene
C) (2Z,4
E)-2,4-heptadiene
D) (2E,4
Z)-2,4-hexadiene
E) (2Z,3
E)-2,3-hexadiene

Question

What is the proper IUPAC name for the following molecule: 
A) (2E,4
Z)-2,4-heptadiene 
B) (2E,3
Z)-2,3-heptadiene 
C) (2Z,4
E)-2,4-heptadiene 
D) (2E,4
Z)-2,4-hexadiene 
E) (2Z,3
E)-2,3-hexadiene

Quizplus · Accepted Answer

The molecule has two double bonds, so it is a diene. Counting from the left side of the molecule (with the terminal carbon on the left being C1), the first double bond is between C2 and C3, and the second double bond is between C4 and C5. Both double bonds are in the E/Z configuration. From C2 to C5, there are four carbons in a row, so the diene is heptadiene. Therefore, the correct name is (2Z,4E)-2,4-heptadiene.

What Is the Proper IUPAC Name for the Following Molecule