An Optically Active Hexose,A,C₆H₁₂O₆,was Degraded to an Optically Active Pentose

question 17

Essay

An optically active hexose,A,C₆H₁₂O₆,was degraded to an optically active pentose (B),C₅H₁₀O₅,by the following series of reactions: Compound (B)was degraded to an optically active tetrose (C)C₄H₈O₄,through the same series of reactions as shown above,then (B)and (C)oxidized with HNO₃ to yield the optically active tartaric acid.
Give possible structure for (A)and (B).

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