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JEE Main levelSingle correct optionDifficulty 2 of 3o2185

cis-But-2-ene is treated with and then . The product is

  1. Abutan-1-ol
  2. Bbutan-2-ol as a racemic mixture, optically inactive
  3. C(S)-butan-2-ol only
  4. D(R)-butan-2-ol only

Answer: B

Each carbon of but-2-ene is equivalent, so the product is butan-2-ol. The new stereocentre forms by attack on either face of the planar alkene with equal probability. The product is a racemic, optically inactive mixture.
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