Assertion : A compound has fixed melting and boiling point.
Reason : The formation of a compound occurs because of a chemical reaction.

Options

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

Explanation

To analyze the given assertion and reason, we will break down the concepts involved and evaluate their validity step by step.

### Step 1: Understand the Assertion
The assertion states that "A compound has fixed melting and boiling points."

- **Explanation**: Compounds are substances formed when two or more different types of atoms bond together chemically. The nature of these bonds (ionic or covalent) leads to specific physical properties, including fixed melting and boiling points. For example, water (H2O) has a fixed melting point of 0°C and a boiling point of 100°C at standard atmospheric pressure.

### Step 2: Understand the Reason
The reason states that "The formation of a compound occurs because of a chemical reaction."

- **Explanation**: This statement is true. Compounds are formed when elements undergo chemical reactions, resulting in the formation of new substances with distinct properties. For example, when hydrogen gas reacts with oxygen gas, water is formed through a chemical reaction.

### Step 3: Evaluate the Relationship Between Assertion and Reason
Now we need to determine if the reason provided is a correct explanation for the assertion.

- **Analysis**: While both the assertion and reason are true, the reason does not directly explain why compounds have fixed melting and boiling points. The fixed melting and boiling points are due to the strong bonds between the atoms in the compound, not solely because they are formed through a chemical reaction.

### Conclusion
- **Final Evaluation**: The assertion is true, and the reason is also true, but the reason does not correctly explain the assertion. Therefore, the correct answer would be that both statements are true, but the reason is not the correct explanation for the assertion.

### Answer
- The assertion is true, and the reason is true, but the reason is not the correct explanation of the assertion.