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JEE Advanced levelSingle correct optionDifficulty 3 of 3co033

Ethanoyl chloride is treated with (X) lithium dimethylcuprate at 195 K and with (Y) excess followed by . The organic products X and Y are respectively

  1. A2-methylpropan-2-ol and propanone
  2. Bpropanone and 2-methylpropan-2-ol
  3. Cpropanone and propan-2-ol
  4. Dethanal and propan-2-ol

Answer: B

The Gilman reagent is not reactive enough to attack the product ketone, so it stops at . A Grignard reagent attacks the ketone as well, so two methyl groups are added to give .
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