Gluconic acid is obtained when
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Glucose is treated with a mild oxidizing agent like bromine water.
Gluconic acid is formed by mild oxidation of the aldehyde (–CHO) group of glucose to a carboxylic acid (–COOH) without affecting the –OH groups.
Option 1 Sucrose hydrolysis gives glucose and fructose. No oxidation occurs.
Option 2 Glucose + Br₂ water → Gluconic acid Selective oxidation of –CHO group. Correct.
Option 3 Hydrolysis of starch produces glucose. No oxidation.
Option 4 Heating with HI reduces glucose to n-hexane. No gluconic acid formed.