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JEE Main levelSingle correct optionDifficulty 2 of 3o3266

The epoxide shown is treated with a catalytic amount of in methanol. Which structure is the major product?

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

Answer: C

The compound is 2,2-dimethyloxirane. In acid, the protonated epoxide has -like character: the tertiary carbon carries most of the positive charge, so methanol attacks there. The product is 2-methoxy-2-methylpropan-1-ol, COC(C)(C)CO.
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