The designations d and l as applied to sugars refer to the configuration of the highest-numbered stereocenter. If the configuration of the highest numbered stereocenter of d-ribose (Figure 24-1) is switched from d to l, is the product l-ribose? If not, what is the product? How is it related to d-ribose (i.e., what kind of isomers are they)? 

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Figure 24-1 D-Aldoses (up to the aldohexoses), their signs of rotation, and their common CHO н— он CH;OH names. СНО CHO D-(+)-Glyceraldehyde H OH Но- H- H- CH,OH Н— он CHOH Но- D-(-)-Erythrose D-(-)-Threose CHO СНО CHO CHO H- -ОН Но H- H. -ОН Но- H. H- HO- H- -OH Но- -H HO- -H H- -OH H- -OH H- -OH H- OH CH-OH CH-OH ČH-OH CH,OH D-(-)-Ribose D-(-)-Arabinose D-(+)-Xylose D-(-)-Lyxose CHO CHO CHO CHO CHO CHO CHO CHO H. -ОН НО -H- H- OH HO- Но- H OH Но H- OH H- OH HO- -H- HO- H- H- OH H- HO- HO- Но HO- OH H- -ОН — ОН HO- H- Но- H- НО H- Но- -H H- FOH H. O- H- -ОН H- FOH H- FOH H- -ОН H- —ОН H- -ОН CH2OH CH;OH CH;OH CH,OH CH;OH CH2OH CH2OH CHOH D-(+)-Allose D-(+)-Altrose D-(+)-Glucose D-(+)-Мannose D-(-)-Gulose D-(-)-Idose D-(+)-Galactose D-(+)-Talose