An Aldopentose Is Oxidized with Sodium Nitrite and Nitric Acid

question 24

Multiple Choice

An aldopentose is oxidized with sodium nitrite and nitric acid to produce an optically active aldaric acid.The same aldopentose is treated with Ruff degradation conditions and the product is Reduced with sodium borohydride to give an optically inactive alditol.Which of the following Structures is the aldopentose?

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