Assertion (A): Camphor is used as a solvent in the determination of the molecular mass of naphthalene and anthracene.
Reason (R ): camphor has high molal elevation constant.

Options

A. If both `(A)` and `(R )` are correct, and `(R )` is the correct explanation of `(A)`.
B. If both `(A)` and `(R )` are correct, but `(R )` is not the correct explanation of `(A)`.
C. If `(A)` is correct, but `(R )` is incorrect.
D. If `(A)` is correct, but `(R )` is correct.

Explanation

To solve the assertion and reason question regarding the use of camphor as a solvent in the determination of the molecular mass of naphthalene and anthracene, we can follow these steps:

### Step 1: Understand the Assertion
The assertion states that "Camphor is used as a solvent in the determination of the molecular mass of naphthalene and anthracene." This is true because camphor is a common solvent used in colligative property experiments, such as boiling point elevation, to determine molecular masses of solutes.

**Hint:** Look for common solvents used in colligative property experiments.

### Step 2: Understand the Reason
The reason states that "Camphor has a high molal elevation constant." This is also true. The molal elevation constant (K_b) is a measure of how much the boiling point of a solvent increases when a solute is added. A higher K_b value means that the solvent can produce a more significant elevation in boiling point, which enhances the accuracy of molecular mass determination.

**Hint:** Recall the significance of the molal elevation constant in determining molecular masses.

### Step 3: Relate the Assertion and Reason
The assertion and reason are related. The reason explains why camphor is used as a solvent for determining the molecular mass of naphthalene and anthracene. Since camphor has a high molal elevation constant, it allows for more precise measurements of the elevation in boiling point, which is essential for calculating molecular mass.

**Hint:** Consider how the properties of a solvent affect the experimental results in colligative properties.

### Step 4: Conclusion
Both the assertion and the reason are correct, and the reason provides a correct explanation for the assertion. Therefore, we conclude that:

- Both A (Assertion) and R (Reason) are correct.
- R is the correct explanation of A.

**Final Answer:** Both A and R are correct, and R is the correct explanation of A.