A : Micelles can be formed at above CMC and at below Kraft temperature.
R : For NaCl solution, Kraft temperature is `60^(@)` C .

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, mark (1)
B. If both Assertion & Reason are true but reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Resson are false statements , then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reasoning (R) provided.

### Step 1: Understand the Assertion (A)
The assertion states that "Micelles can be formed at above CMC and below Kraft temperature."
- **Critical Micelle Concentration (CMC)** is the concentration of surfactants above which micelles are formed.
- **Kraft Temperature** is the temperature above which micelles can form in a surfactant solution.

### Step 2: Analyze the Assertion
- Micelles indeed form above the CMC. This part of the assertion is true.
- However, micelles typically form at or above the Kraft temperature, not below it. Therefore, the second part of the assertion is false.

### Conclusion on Assertion (A)
Thus, the assertion is **false** because while micelles can form above CMC, they cannot form below Kraft temperature.

### Step 3: Understand the Reasoning (R)
The reasoning states that "For NaCl solution, Kraft temperature is 60°C."
- NaCl is a salt and does not form micelles like surfactants do. The Kraft temperature is relevant for surfactants, not for ionic compounds like NaCl.

### Step 4: Analyze the Reasoning
- Since NaCl does not have a Kraft temperature in the context of micelle formation, this statement is also **false**.

### Conclusion on Reasoning (R)
The reasoning is therefore **false** because NaCl does not have a Kraft temperature relevant to micelle formation.

### Final Conclusion
Both the assertion (A) and the reasoning (R) are false.

### Answer
Both assertion and reasoning are false.

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