5 Which structure has the name E‑2‑bromo‑3‑chloropent‑2‑ene?
ANSWER
A 
Analysis of Option/Explanation
Remember that if the two highest priority groups on each carbon atom are on the same side of the double bond, it is a Z isomer. If they are on opposite sides, it is an E isomer.
Option B
The said structure is Z-2-bromo-3-chloropent-ene.
Option C
the said structure is E-3-bromo-2-chloropent-2-ene.
Option D
The said structure is E-4-bromo-3-chloropent-2-ene.
Option A
The said structure is E-2-bromo-3-chloropent-2-ene, which is required in the question. Hence, Option A is the correct answer.
