The product obtained, when starch is hydrolyzed with dilute sulphuric acid at 393 K under pressure, is
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Glucose only
The reaction shown represents the hydrolysis of starch.
Hydrolysis of Starch
- Starch: Starch is a polysaccharide, meaning it is a naturally occurring polymer made up of a large number of monosaccharide units. The basic repeating unit is $\alpha-\text{D}-\text{glucose}$.
- Hydrolysis Conditions: The reaction involves heating starch with dilute acid (like $\text{H}_2\text{SO}_4$, represented by $\text{H}^+$) at an elevated temperature ($\text{393 K}$) and pressure.
- Process: Hydrolysis is the chemical breakdown of a compound (starch) due to reaction with water. Under these conditions, the glycosidic linkages between the $\alpha-\text{D}-\text{glucose}$ units in the starch polymer are completely broken.
- Product: The complete hydrolysis of starch yields the smallest carbohydrate unit, which is the monomer unit itself.
The product obtained is:
$$\mathbf{n\text{C}_6\text{H}_{12}\text{O}_6} \quad (\alpha-\text{D}-\text{Glucose})$$
The product obtained, when starch is hydrolyzed with dilute sulphuric acid at $\text{393 K}$ under pressure, is $\alpha-\text{D}-\text{Glucose}$ (or simply Glucose).