From the choices given below select the D aldopentose that yields an optically a

Question

From the choices given below select the D aldopentose that yields an optically active alditol upon reduction with NaBH4. Select ALL monosaccharides that satisfy the requirement, excluding the structure referenced in the question. Note that only D structures are shown. To select an L structure click on the name. If no selection exists, then select the referenced structure. -OH HO H OH HO H- OH HO H H OH OH 20H D-Xylose D-Lyoose L-Arabinose L-Xylose L-Ribose L-Lynxose 1 more group attempt remaining

Explanation / Answer

1. D-arabinose upon reduction with NaBH4 gives alditol which does not have any symmetry element in it and thus would be optically active. All the rest would have a center or line of symmetry and are optically inactive.

2. D-altrose and L-tallose would yield optically active alditol upon reduction with NaBH4

3. L-altrose would yield the same product as D-gluose upon reduction with NaBH4

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