Periodic acid splits glucose and fructose into formaldehyde and formic acid, Ratio of moles of formic acid in glucose and fructose is

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C H O - C H O H - C H O H g l u c o s e - C H O H - C H O H - C H 2 O H → 5 H I O 4 5 H C O O H + H C H O + 5 H I O 3 CH 2 OH − C O | | − CHOH fructose − CHOH − CHOH − CH 2 OH → 5 HIO 4 3 HCOOH + 2 HCHO + 5 HIO 3 + CO 2 + H 2 O So molar ratio is 5:3

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