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JEE Main levelSingle correct optionDifficulty 2 of 3ro267

The allylic alcohol shown is treated with PCC in . Which structure is the product?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: A

The compound is (E)-but-2-en-1-ol. PCC oxidises the primary allylic alcohol to the aldehyde without touching the C=C bond or its E geometry, giving (E)-but-2-enal (crotonaldehyde). The acid would be the Jones product, and the saturated aldehyde would need hydrogenation.
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