Glucose on reaction with bromine water gives:

Question

Accepted Answer

Glucose on reaction with bromine water gives gluconic acid. Let's explore why Option 3 is the correct answer and why the other options are incorrect.

1. **Explanation for Option 3 (Gluconic acid):**
   - Glucose is an aldose sugar, meaning it contains an aldehyde group. When glucose reacts with bromine water, the aldehyde group is oxidized to a carboxylic acid group. This specific reaction converts the aldehyde group at the C-1 position of glucose into a carboxylic acid, resulting in the formation of gluconic acid. Bromine water acts as a mild oxidizing agent in this reaction, and this transformation is a well-known chemical process in carbohydrate chemistry.

2. **Why Option 1 (n-hexane) is incorrect:**
   - n-Hexane is a saturated hydrocarbon with the formula C6H14. It is not related to glucose or its oxidation products. The reaction of glucose with bromine water does not involve the formation of hydrocarbons like n-hexane. Therefore, this option is incorrect.

3. **Why Option 2 (Saccharic acid) is incorrect:**
   - Saccharic acid, also known as glucaric acid, is a different compound that is typically formed by the oxidation of glucose using stronger oxidizing agents like nitric acid. The reaction with bromine water is not strong enough to produce saccharic acid from glucose. Hence, this option is incorrect in the context of the reaction with bromine water.

4. **Why Option 4 (Bromo glucose) is incorrect:**
   - Bromo glucose would imply the substitution of a bromine atom into the glucose molecule. However, the reaction of glucose with bromine water does not involve halogenation or the addition of bromine atoms to the glucose structure. Instead, it involves the oxidation of the aldehyde group to a carboxylic acid. Therefore, this option is incorrect.

In conclusion, the reaction of glucose with bromine water specifically leads to the formation of gluconic acid, making Option 3 the correct answer.