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Though fructose is a keto hexose, it is ...

Though fructose is a keto hexose, it is a reducing sugar. Why? 

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In aqueous basic solution like Fehling.s solution or Tollen.s reagent, fructose undergoes Lobry de Bruyn van Ekenstein rearrangement. The reaction leads to form a mixture of D-glucose, D-mannose and D-fructose.
Hence fructose acts as reducing sugar
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AAKASH SERIES-BIOMOLECULES-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS :)
  1. Though fructose is a keto hexose, it is a reducing sugar. Why?

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  2. (A) Fructose has ketone group and does not reduce Tollen's reagent. ...

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  3. (A) All carbohydrates fit in the general formula Cx(H2O)y where x=y ...

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  4. (A) Glucose shows mutarotation (R) Glucose is in pyranose form and h...

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  5. (A) Sucrose is not a reducing sugar. (R) In sucrose, glucose is in p...

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  6. (A) When alpha-D glucose dissolved in water, specific rotation of the ...

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  7. (A) Fructose is the sweetest naturally occuring sugar. (R) Fructose...

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  8. (A) Cellulose is not digested by human beings. (R) Human beings are ...

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  9. (A) Hydrolysis of sucrose is called inversion of cane sugar. (R) Sucr...

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  10. (A) In a sucrose molecule, glucose is present in the furanose form and...

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  11. (A) Reducing sugars undergo mutarotion. (R) During mutarotation, one...

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  12. (A) Galactose is the C4 epimer of glucose. (R) Glucose and galacto...

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  13. (A) Sucrose is an example of reducing sugar. (R) Sucrose gives silve...

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  14. (A) Two different hexoses may give the same osazone. (R) Different H...

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  15. (A) alpha-D (+) Glucose and beta-D(+) - Glucose are enantiomers. (R)...

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  16. (A) Reduction of glucose with sodium borohydride gives sorbitol. (R)...

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  17. (A) Glucose and fructose give the same osazone. (R) Glucose and fruc...

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  18. (A): Fructose gives positive Tollen's test. (R) : Fructose is a Keto...

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  19. (A) Cane sugar undergoes inversion in aqueous solution. (R) Cane sug...

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  20. (A) C6 H(10) O5 is a carbohydrates. (R) Most of the carbohydrates ha...

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  21. (A) Lactose is a reducing sugar. (R) Lactose contains glucose and ga...

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