Assertion. The molecularity of the reaction `H_(2)+Br_(2) to 2" HBr is "2.`
Reason. The order of the reaction is `3//2`.

Options

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

Explanation

To solve the question regarding the assertion and reason related to the reaction \( H_2 + Br_2 \rightarrow 2 HBr \), we will analyze both the assertion and the reason step by step.

### Step 1: Understanding Molecularity
**Molecularity** refers to the number of reactant molecules that collide to produce the reaction. In the given reaction:
- \( H_2 \) (1 molecule) + \( Br_2 \) (1 molecule) → \( 2 HBr \)

Here, two molecules (one of \( H_2 \) and one of \( Br_2 \)) are involved in the reaction. Therefore, the molecularity of this reaction is:
- **Molecularity = 2** (bimolecular reaction).

### Step 2: Understanding Order of Reaction
**Order of reaction** is defined as the sum of the powers of the concentration terms in the rate law expression. The order can be determined experimentally and can be a whole number, fraction, or zero.

In this case, the order of the reaction is stated to be \( \frac{3}{2} \). This indicates that the rate of the reaction depends on the concentrations of the reactants raised to certain powers that sum up to \( \frac{3}{2} \).

### Step 3: Analyzing the Assertion and Reason
- **Assertion**: The molecularity of the reaction \( H_2 + Br_2 \rightarrow 2 HBr \) is 2. (This is **true**).
- **Reason**: The order of the reaction is \( \frac{3}{2} \). (This can also be **true** based on experimental data).

### Step 4: Conclusion
Both the assertion and the reason are true. However, the reason does not explain the assertion correctly. The molecularity is based on the number of molecules involved in the reaction, while the order of the reaction is derived from experimental data and does not directly relate to molecularity.

Thus, the final conclusion is:
- **Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.**

### Final Answer
The correct option is that both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

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