Two D-aldopentoses give the same D-aldotetrose upon Ruff degradation. The two al

Question

Two D-aldopentoses give the same D-aldotetrose upon Ruff degradation. The two aldopentoses are: enantiomers. meso compounds. C2 epimers. C4 epimers. D-glucose and D-galactose. When D-(+)-xylose is treated with nitric acid, which of the following results? a racemic mixture of aldaric acids an optically active aldaric acid an optically inactive aldaric acid an optically active aldonic acid an optically inactive aldonic acid When L-(+)-idose is treated with bromine water, which of the following results? a racemic mixture of aldaric acids an optically active aldaric acid an optically inactive aldaric acid an optically active aldonic acid an optically inactive aldonic acid

Explanation / Answer

QUESTION 52

Solution: (C)

Ruff degredation only involves the C1 aldehyde group and C2 site of any aldose. The C2 site is converted into an aldehyde group and C1 to removed. To give the same products, these must be C2 epimers.

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