Question:medium
What happens when D-glucose is treated with the following reagents?
(a) Br$_2$ water
(b) HCN
What happens when D-glucose is treated with the following reagents?
(a) Br$_2$ water
(b) HCN
(a) Br$_2$ water
(b) HCN
Show Hint
Bromine water is a mild oxidizing agent that selectively oxidizes the aldehyde (-CHO) group to a carboxyl (-COOH) group without affecting the hydroxyl (-OH) groups.
Updated On: Jan 21, 2026
Show Solution
Solution and Explanation
(a) Br2 water
Treatment of D-glucose with bromine water (Br2 in H2O) results in the selective oxidation of the C-1 aldehyde (-CHO) group to a carboxylic acid (-COOH), yielding D-gluconic acid.
(b) HCN
Reaction of D-glucose with hydrogen cyanide (HCN) involves the aldehyde group (-CHO) at C-1, which reacts with HCN to form a cyanohydrin (-C(OH)(CN)). This process extends the carbon chain by one unit, producing a cyanohydrin derivative.
Was this answer helpful?
1
Top Questions on Carbohydrates
- Given below are two statements:
Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.
Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.
In the light of the above statements, choose the correct answer from the options given below.- JEE Main - 2026
- Chemistry
- Carbohydrates
- Assertion (A): Glucose gets oxidized to six carbon gluconic acid on reaction with bromine water. Reason (R): The carbonyl group is absent in the open chain structure of glucose. Choose the correct option:
- CBSE Class XII - 2026
- Chemistry
- Carbohydrates
- Which of the following reactions is not explained by the open chain structure of glucose?
- CBSE Class XII - 2026
- Chemistry
- Carbohydrates
- Statement-I: Sucrose is dextrorotatory and upon hydrolysis, it becomes laevorotatory. Statement-II: Sucrose on hydrolysis gives glucose and fructose such that the laevorotation of glucose is more than dextrorotation of fructose. Which of the following is correct?
- JEE Main - 2026
- Chemistry
- Carbohydrates
- Want to practice more? Try solving extra ecology questions todayView All Questions
