Assertion (A): Graphite is a good conductor of electricity, however, diamond belongs to the category of insulators.
Reason (R): Graphite is soft in nature, on the other hand diamond is very hard and brittle.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is True

Explanation

To analyze the given assertion and reason, we will break down the information step by step.

### Step 1: Understanding the Assertion (A)
The assertion states that "Graphite is a good conductor of electricity, however, diamond belongs to the category of insulators."

- **Graphite**: It is composed of carbon atoms arranged in layers. Each carbon atom is bonded to three other carbon atoms, leaving one electron free to move. This delocalization of electrons allows graphite to conduct electricity.
- **Diamond**: In contrast, diamond has a tetrahedral structure where each carbon atom is bonded to four other carbon atoms. This structure does not allow for free electrons to move, making diamond an insulator.

### Step 2: Understanding the Reason (R)
The reason states that "Graphite is soft in nature, on the other hand diamond is very hard and brittle."

- **Graphite**: The layers in graphite can slide over each other easily, which gives it a soft and slippery feel. This property is due to the weak van der Waals forces between the layers.
- **Diamond**: Diamond has a strong covalent bond structure, making it extremely hard and brittle. The rigidity of the bonds contributes to its hardness.

### Step 3: Evaluating the Relationship Between A and R
Now we need to evaluate if the reason (R) correctly explains the assertion (A).

- The assertion is true: Graphite is a good conductor, and diamond is an insulator.
- The reason is also true: Graphite is soft, and diamond is hard and brittle.
- However, the reason does not explain why graphite conducts electricity while diamond does not. The conductivity is due to the presence of free electrons in graphite, which is not addressed in the reason provided.

### Conclusion
Both the assertion and reason are true, but the reason does not correctly explain the assertion. Therefore, the correct answer is that both A and R are true, but R is not the correct explanation of A.

### Final Answer
**Option 2**: Both A and R are true, but R is not the correct explanation of A.