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JEE Main levelSingle correct optionDifficulty 2 of 3bm224

The reference compound shown has the D configuration. Which of Structures A to D is a D-aldopentose?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: B

A D-aldopentose has a CHO group, five carbons and an R stereocentre at C-4 (OH on the right in the Fischer projection). Structure with CHO and R at C-4 is D-ribose. The L-aldopentose has S at C-4, fructose is a ketohexose and glucose is an aldohexose.
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