Carbohydrates: classification, glucose, fructose
- Sugar 'X'A. is found in honey.B. is a keto sugar.C. exists in α and β - anomeric forms.D. is laevorotatory.'X' is : Answer: 2. D-Fructose Key idea: match each property. D-Fructose is present in honey, is a keto sugar (ketohexose), exists as α and β anomers... 1
- Fehling's solution 'A' is Answer: 2. aqueous copper sulphate Key idea: Fehling's solution is prepared as two separate solutions. Fehling's A: aqueous copper sulphate.... 1
- The reagents with which glucose does not react to give the corresponding tests/products areA. Tollen's reagent B. Schiff's reagent C. HCN D. NH_2OH E. NaHSO_3Choose the correct options from the given below: Answer: 4. B and E Key idea: glucose exists mostly as the cyclic hemiacetal, so it gives some but not all aldehyde reactions. Tollens' reage... 1
- The difference between amylose and amylopectin is Answer: 1. Amylopectin have 1 → 4 α -linkage and 1 → 6 α -linkage Both amylose and amylopectin are polymers of α -D-glucose, and they differ... 1
- The correct corresponding order of names of four aldoses with configuration given below [four Fischer projections] respectively, is Answer: 3. D-erythrose, D-threose, L-erythrose, L-threose Key idea: D/L is decided by the OH on the lowest chiral carbon (right = D). Erythr... 1