Using Table 24.2 to assist you, draw a Fischer projection for the structure of 

(a) Galac turonic acid, the uronic acid derived from galactose; 

(b) Ribitol, the alditol derived from ribose.

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TABLE 24.2 Structures of Common Oxidation and Reduction Products of Aldoses X-CH-Y (OH). X-= HOCH₂- HOCH₂- HO₂C- HOCH₂- HO₂C- Derivative structure -Y = —CH=0 —CO,H —CO,H -CH₂OH -CH=0 General structure: General name aldose aldonic acid aldaric acid alditol uronic acid Example derived from glucose glucose gluconic acid glucaric acid glucitol glucuronic acid