Chapter 145 of 2363 min read
Carbohydrates
Why this is asked: Sucrose is the classic non-reducing sugar because its glycosidic bond ties up both anomeric carbons — C1 of glucose and C2 of fructose — leaving no free anomeric OH to open into a reactive aldehyde or ketone, unlike maltose and lactose, which keep one free and do reduce Fehling's or Tollens'. This is also why sucrose shows no mutarotation, while glucose's optical rotation visibly drifts as its α and β anomers interconvert through the open-chain form.
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- •Sugar 'X': A. is found in honey B. is a keto sugar C. exists in and anomeric forms D. is laevorotatory 'X' is:
- •The reagents with which glucose does not react to give the corresponding tests/products are: A. Tollens' reagent B. Schiff's reagent C. HCN D. E. Choose the correct option from those given below:
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