A: One mole of sucrose-reacts completely with oxygen produces 268.8 litre of carbon dioxide at STP.
R: Amount of oxygen required for reaction is 268.8 litre.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion
C. If Assertion is true statement but Reason is false
D. If both Assertion and Reason are false statements

Answer

To solve the problem, we need to analyze the assertion and reason statements provided.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
The chemical formula for sucrose is C₁₂H₂₂O₁₁. When sucrose reacts with oxygen (O₂), it produces carbon dioxide (CO₂) and water (H₂O). The balanced equation for the combustion of sucrose can be written as:
\[ C_{12}H_{22}O_{11} + O_2 \rightarrow CO_2 + H_2O \]

2. **Balancing the Reaction**:
To balance the reaction, we need to ensure that the number of atoms for each element is the same on both sides. The balanced equation is:
\[ C_{12}H_{22}O_{11} + 12 O_2 \rightarrow 12 CO_2 + 11 H_2O \]
This shows that 1 mole of sucrose produces 12 moles of carbon dioxide.

3. **Calculating the Volume of CO₂**:
At standard temperature and pressure (STP), 1 mole of any gas occupies 22.4 liters. Therefore, the volume of 12 moles of CO₂ produced is:
\[ \text{Volume of } CO_2 = 12 \text{ moles} \times 22.4 \text{ L/mole} = 268.8 \text{ L} \]

4. **Assertion Evaluation**:
The assertion states that 1 mole of sucrose reacts completely with oxygen to produce 268.8 liters of carbon dioxide at STP. Based on our calculations, this statement is true.

5. **Reason Evaluation**:
The reason states that the amount of oxygen required for the reaction is 268.8 liters. From the balanced equation, we see that 1 mole of sucrose reacts with 12 moles of oxygen. Thus, the volume of oxygen required at STP is also:
\[ \text{Volume of } O_2 = 12 \text{ moles} \times 22.4 \text{ L/mole} = 268.8 \text{ L} \]
This statement is also true.

6. **Conclusion**:
Both the assertion and reason are true. However, the reason does not correctly explain the assertion because it does not directly relate to the production of CO₂ from sucrose. Therefore, the correct option is that both statements are true, but the reason is not a correct explanation of the assertion.

### Final Answer:
- Assertion (A) is true.
- Reason (R) is true but does not explain A.