Assertion (A): The rate of reaction increases generally by `2` to `3` times for every `10^(@)C` rise in temperature.
Reason (R ): An increase intemperature increases the colliison frequency.

Options

A. If both `(A)` and `(R )` are correct, and `(R )` is the correct explnation of `(A)`.
B. If both `(A)` and `(R )` are correct, but `(R )` is noth the correct explanation of `(A)`.
C. If `(A)` is correct, but `(R )` is incorrect.
D. If `(A)` is incorrect, but `(R )` is correct.

Explanation

To analyze the assertion and reason provided in the question, we will break down each statement and evaluate their validity.

### Step 1: Evaluate the Assertion (A)
The assertion states: "The rate of reaction increases generally by 2 to 3 times for every 10°C rise in temperature."

- This statement is based on the concept of the temperature coefficient, which is often observed in chemical reactions. It is generally accepted that for many reactions, the rate of reaction approximately doubles or triples with every 10°C increase in temperature. This is due to the increase in kinetic energy of the molecules, which leads to more frequent and effective collisions.

**Conclusion for Assertion (A)**: True.

### Step 2: Evaluate the Reason (R)
The reason states: "An increase in temperature increases the collision frequency."

- This statement is also true. When the temperature of a system increases, the kinetic energy of the molecules increases, leading to a higher frequency of collisions between reactant molecules. More collisions can result in a higher rate of reaction.

**Conclusion for Reason (R)**: True.

### Step 3: Determine the Relationship Between Assertion and Reason
Now we need to determine if the reason correctly explains the assertion.

- While both statements are true, the reason does not directly explain why the rate of reaction increases by 2 to 3 times for every 10°C rise in temperature. The increase in collision frequency is a contributing factor, but the assertion is more accurately explained by the increase in the rate constant (k) due to temperature, as described by the Arrhenius equation.

### Final Conclusion
Both the assertion and the reason are true, but the reason does not correctly explain the assertion.

Thus, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion.