When reducing what sugar is formed, the polyhydric alcohol will be optically active.

All monosaccharides are optically active, but alcohols .. If we take D-glucose, we get D-sorbitol, depending on how much to restore. Let’s say it is only an aldehyde group. Then it turns out, no matter what atom we take, except for the extreme ones, probably the second, third, etc. they will be asymmetrical.



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