Answer:
(E)-5-ethylhepta-2,4-diene
Explanation:
The (E)-5-bromo-5-ethylhept-2-ene will undergo an E2 reaction. The ethoxide (⁻OCH₂CH₃) will deprotonate at the allylic position so that a conjugated diene results, which is more stable than a non-conjugated diene.
The stereochemistry in the name of the final product is indicated for only one double bond since the other has two identical groups on it.
