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JEE Advanced levelSingle correct optionDifficulty 3 of 3co008

An equimolar mixture of calcium ethanoate and calcium propanoate is dry distilled. How many different ketones are expected? (Count only once.)

  1. A3
  2. B6
  3. C2
  4. D4

Answer: A

Three combinations of the two anions are possible: ethanoate with ethanoate gives propanone, propanoate with propanoate gives pentan-3-one, and the cross combination gives butan-2-one. The cross product is one compound whichever way it is written, so the total is 3.
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