Assertion : The heat of a reaction does not depend upon the temperature at which reaction is carried out.
Reason : Temperature is a state function.

Options

A. If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.
B. If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.
C. If Assertion is CORRECT but Reason is INCORRECT.
D. If Assertion is INCORRECT but Reason is CORRECT.

Explanation

To solve the assertion-reason question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "The heat of a reaction does not depend upon the temperature at which the reaction is carried out."

- This statement is **incorrect**. The heat of a reaction, often represented as enthalpy change (ΔH), is influenced by the temperature at which the reaction occurs. Different temperatures can lead to different values of ΔH because the internal energy and the pressure-volume work can change with temperature.

### Step 2: Analyze the Reason
The reason states: "Temperature is a state function."

- This statement is **correct**. Temperature is indeed a state function, meaning it depends only on the current state of the system (initial and final conditions) and not on how the system reached that state. However, while temperature is a state function, it does not imply that the heat of a reaction (enthalpy change) is independent of temperature.

### Step 3: Conclusion
- Since the assertion is incorrect and the reason is correct, the relationship between them does not hold. Therefore, the correct answer is that the assertion is incorrect, and the reason is correct.

### Final Answer:
- **Assertion**: Incorrect
- **Reason**: Correct
- **Correct Option**: D (Assertion is incorrect, Reason is correct)