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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bm045

Which statements about D-fructose are correct?

  1. AIt is a ketohexose.
  2. BIts open-chain form has three stereocentres.
  3. CIt gives gluconic acid with bromine water.
  4. DIn its furanose form C-2 is the anomeric carbon.

Answer: A, B, D

Fructose has a ketone at C-2 and stereocentres at C-3, C-4, C-5. In the furanose ring C-2 bears the OH and ring O, so it is anomeric. Bromine water does not oxidise a ketose.
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