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An Optically Active Hexose (A),C6H12O6,was Degraded to an Optically Active

Question 84

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An optically active hexose (A),C6H12O6,was degraded to an optically active pentose (B),C5H10O5,by the following series of reactions: An optically active hexose (A),C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>,was degraded to an optically active pentose (B),C<sub>5</sub>H<sub>10</sub>O<sub>5</sub>,by the following series of reactions: Compound (B)was degraded to an optically active tetrose (C),C<sub>4</sub>H<sub>8</sub>O<sub>4</sub>,through the same series of reactions as shown above; then (C)was oxidized with HNO<sub>3</sub> to yield meso tartaric acid. Give possible structure for (A)and (B). Compound (B)was degraded to an optically active tetrose (C),C4H8O4,through the same series of reactions as shown above; then (C)was oxidized with HNO3 to yield meso tartaric acid.
Give possible structure for (A)and (B).

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