Assertion (A) : `P_(4)` is more reactive than `N_(2)`
Reason (R) : `P-P` bonds are relatively weaker than `N-=N`

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion , then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
C. If Assertion is true statement but Reason is false , then mark (3)
D. If both Assertion and Reason are false statements , then mark (4)

Answer

To solve the assertion-reason question regarding the reactivity of \( P_4 \) compared to \( N_2 \), we will analyze both the assertion and the reason step by step.

### Step 1: Understanding the Assertion
The assertion states that \( P_4 \) is more reactive than \( N_2 \).

- **Explanation**: Reactivity in elements often depends on the strength of the bonds within the molecules. The weaker the bonds, the easier it is for the molecule to react with other substances.

### Step 2: Analyzing the Structures
Let’s look at the structures of \( P_4 \) and \( N_2 \):

- **Structure of \( P_4 \)**: The molecule consists of four phosphorus atoms arranged in a tetrahedral structure. The bonds between phosphorus atoms are single \( P-P \) bonds.

- **Structure of \( N_2 \)**: The molecule consists of two nitrogen atoms connected by a triple bond \( N \equiv N \).

### Step 3: Comparing Bond Strengths
Next, we need to compare the bond strengths:

- **Bond Strength of \( P-P \)**: Single bonds (like \( P-P \)) are generally weaker than double or triple bonds.

- **Bond Strength of \( N \equiv N \)**: Triple bonds (like \( N \equiv N \)) are among the strongest types of covalent bonds.

### Step 4: Conclusion on Reactivity
Since \( P-P \) bonds are weaker than \( N \equiv N \) bonds, it follows that:

- **Reactivity**: \( P_4 \) can break its bonds more easily than \( N_2 \) can break its triple bond. Therefore, \( P_4 \) is indeed more reactive than \( N_2 \).

### Step 5: Analyzing the Reason
The reason states that \( P-P \) bonds are relatively weaker than \( N \equiv N \) bonds.

- **Verification**: This statement is true, as we have established that single bonds are weaker than triple bonds.

### Final Conclusion
Both the assertion and the reason are correct, and the reason correctly explains the assertion.

### Summary:
- **Assertion (A)**: \( P_4 \) is more reactive than \( N_2 \) - **True**
- **Reason (R)**: \( P-P \) bonds are relatively weaker than \( N \equiv N \) - **True**
- **Relationship**: Reason is the correct explanation of the assertion.