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Which of the following is a conjugated diene?

  1. APenta-1,4-diene
  2. BPenta-1,3-diene
  3. CPenta-1,2-diene
  4. DHexa-1,5-diene

Answer: B

In penta-1,3-diene, , the double bonds are separated by one single bond. Penta-1,4-diene and hexa-1,5-diene are isolated dienes, and penta-1,2-diene is cumulated.
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