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JEE Main levelSingle correct optionDifficulty 2 of 3hx207

(R)-2-Chlorobutane reacts with sodium ethanoate in a polar aprotic solvent by a pure SN2 mechanism. The product, butan-2-yl ethanoate, is

  1. Aachiral butyl ethanoate
  2. B(R)-butan-2-yl ethanoate
  3. Cracemic butan-2-yl ethanoate
  4. D(S)-butan-2-yl ethanoate

Answer: D

In the chloride the order is Cl > > > H. In the ester, > > > H, so the order is the same. Inversion therefore turns R into S.
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