Question: Which of the following statement is not true about glucose?
A It is an aldohexose.
B It is present in furanose form.
C On heating with HI, it forms n−hexane.
D It does not give 2, 4−DNP test.
Answer: It is present in furanose form.
| Aspect | Glucose | Fructose |
| Classification | Monosaccharide | Monosaccharide |
| Type of Sugar | Aldohexose | Ketohexose |
| Form | Pyranose | Furanose |
| Reaction with HI | Forms n-hexane (alkane) | Does not react with HI |
| 2,4-DNP Test | Positive | Negative |
| Natural Sources | · starches and sugars | · fruits · honey · some vegetables |
| Digestion and Absorption | Rapidly digested and absorbed in the small intestine. | Absorbed more slowly in the small intestine. |
| Glycemic Index (GI) | Higher GI | Lower GI |
| Taste | Less sweet | Sweeter |
| Role in the Body | Primary fuel for the brain and body muscles | Involved in liver glycogen replenishment |
| Hormonal Response | Stimulates insulin release from the pancreas | Has a lower impact on insulin levels compared to glucose |
| Health Implications | Consuming excessive glucose can contribute to insulin resistance and diabetes | Excessive fructose consumption has been associated with fatty liver disease, obesity and metabolic syndromes |