Question
Write the reactions of D-glucose which can’t be explained by its open-chain structure. How can cyclic structure of glucose explain these reactions?
✓
Answer
Following reactions and facts could not be explained by open chain structure of glucose.
- Despite having the aldehyde group, glucose does not give 2,4-DNP test, Schiff’s test and it does not form the hydrogensulphite addition product with NaHSO3.
- The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free —CHO group.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Draw the tetrahedral intermediate formed by nucleophilic attack on carbonyl carbon in nucleophilic addition reaction.
Complete the following reaction equations:
What advantage do the fuel cells have over primary and secondary batteries?
Elimination reactions (especially β-elimination) are as common as the nucleophilic substitution reaction in case of alkyl halides. Specify the reagents used in both cases.
Discuss the reactivity of aldehydes and ketones towards the nucleophilic addition reaction.
Discuss the physical properties of carboxylic acids in terms of their physical state and boiling point.
The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroacetic acid increases in the order given above. Explain briefly.
Explain reaction of carboxylic acids with metals and alkalies. ### Write the equations for the reactions showing that carboxylic acids are acidic in nature and state theusefulness of this reactions.
Explain the preparation of ketones from acyl chlorides.
Match the structures given in Column I with the names in Column II.
| Column I | Column II | ||
| (i) |  | (a) | 4-Bromopent-2-ene |
| (ii) |  | (b) | 4-Bromo-3-methylpent-2-ene |
| (iii) |  | (c) | 1-Bromo-2-methylbut-2-ene |
| (iv) |  | (d) | 1-Bromo-2-methylbut-2-ene |