Stereochemistry and Structure Proof

Problem 22.17 ( + )-Glucose. ( + )-mannose and (+ )-galactose are among the hexoses isolated after three Kiliani-Fischer step-ups. beginning with d-(+ )-glyceraldehyde. Do these hexoses belong in the d or l families  

Problem 22.18 Write shorthand formulas for the tetroses prepared from (a) L-glycerose, (b) o-glycerose, by the Kiliani-Fischer synthesis. -4 

Problem 22.19 How can oxidation with HNO, be used to distinguish between o-erythrose and o-threose  

Problem 22.20 Two Ruff degradations of an aldohexose give an aldotetrose that is oxidized by HNO, to /n o-tartaric acid. What can be the family configuration of the aldohexose  

Problem 22.21 Which o-aldohexoses give meso-aldaric acids on oxidation with HNO, -4 

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