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NEET levelSingle correct optionDifficulty 1 of 3ro095

cis-But-2-ene is treated with mCPBA. The product is

  1. Acis-2,3-dimethyloxirane
  2. Btrans-2,3-dimethyloxirane
  3. Cbutane-2,3-diol
  4. Dbutan-2-one

Answer: A

Epoxidation by a peroxy acid is a concerted, stereospecific syn addition of oxygen, so the geometry of the alkene is kept. The cis alkene gives cis-2,3-dimethyloxirane, with the two methyl groups on the same side of the ring.
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