`underset("starch")(2(C_6 H_10 O_5)_(n)) + H_2 O overset("Distance")(to)n A overset(H_2 O)(to) 2n B`
A and B in given sequence of reactions, respectively is

Options

A. Maltose, D-Glucose
B. Lactose, D-Glucose
C. Sucrose, D-Glucose
D. Maltose, fructose

Answer

To solve the question regarding the hydrolysis of starch, we can break down the process step-by-step.

### Step-by-Step Solution:

1. **Identify the Reactant**: The reactant given is starch, which has the general formula \( (C_6H_{10}O_5)_n \). This indicates that starch is a polysaccharide made up of multiple units of the disaccharide.

2. **Hydrolysis of Starch**: When starch undergoes hydrolysis, it reacts with water (\( H_2O \)) in the presence of an enzyme. The enzyme that catalyzes the hydrolysis of starch is diastase. The reaction can be represented as:
\[ (C_6H_{10}O_5)_n + n H_2O \xrightarrow{\text{diastase}} n \text{ maltose} \]
Here, maltose is a disaccharide formed from the hydrolysis of starch.

3. **Formation of Maltose**: The product formed from the hydrolysis of starch is maltose. Therefore, in this step, we have:
- A = Maltose (n moles of maltose).

4. **Further Hydrolysis of Maltose**: The maltose produced can undergo further hydrolysis in the presence of another enzyme called maltase. This reaction can be represented as:
\[ n \text{ maltose} + n H_2O \xrightarrow{\text{maltase}} 2n \text{ glucose} \]
Here, each maltose molecule is hydrolyzed to produce two glucose molecules.

5. **Formation of Glucose**: After the hydrolysis of maltose, we get glucose as the final product. Therefore, in this step, we have:
- B = Glucose (2n moles of glucose).

### Conclusion:
Thus, the respective products A and B in the given sequence of reactions are:
- A = Maltose
- B = Glucose

### Final Answer:
A and B are Maltose and Glucose, respectively.