Polysaccharides Their Importance

Which one of the following compounds shows the presence of an intramolecular hydrogen bond?

1. H₂O₂

2. HCN

3. Cellulose

4. Concentrated acetic acid

The reaction of concentrated sulphuric acid with carbohydrates (C₁₂H₂₂O₁₁) is an example of:
1. Dehydration
2. Oxidation
3. Reduction
4. Sulphonation