Glucose is prepared commercially from the hydrolysis of ..... by boiling it with dilute `H_2SO_4` at 3931 under pressure.

Options

A. starch
B. sucrose
C. galactose
D. dextrose

Answer

To solve the question regarding the commercial preparation of glucose through hydrolysis, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Source of Glucose**:
Glucose is commercially produced from the hydrolysis of starch. Starch is a polysaccharide that consists of a large number of glucose units linked together.

2. **Understand the Hydrolysis Process**:
Hydrolysis is a chemical reaction that involves the breaking down of a compound by water. In this case, starch is broken down into glucose molecules.

3. **Conditions for Hydrolysis**:
The hydrolysis of starch to glucose is typically carried out under acidic conditions. In this scenario, dilute sulfuric acid (H₂SO₄) is used as the catalyst for the reaction.

4. **Temperature and Pressure**:
The reaction is performed by boiling the starch with dilute H₂SO₄ at a temperature of 393 Kelvin (approximately 120°C) under pressure. This helps to facilitate the hydrolysis process and increase the yield of glucose.

5. **Final Product**:
The end result of this hydrolysis process is the production of glucose from starch.

### Final Answer:
Glucose is prepared commercially from the hydrolysis of **starch** by boiling it with dilute H₂SO₄ at 393 K under pressure.

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