(A): Phosphorus is more reactive element of Group VA
(R): `N-=N` bond is relatively stronger. 

Options

A. Both A & R are true, R is the correct explanation of A
B. Both A & R are true, R is not correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer

To analyze the given statements and determine their validity, we will break down the reasoning step by step.

### Step 1: Understand Statement A
**Statement A**: "Phosphorus is a more reactive element of Group VA."

- Phosphorus (P) is indeed a member of Group 15 (VA) in the periodic table. It is known to be more reactive than nitrogen (N) and other heavier elements in the group. This is primarily due to the presence of lone pairs and the structure of phosphorus.

### Step 2: Understand Statement R
**Statement R**: "N≡N bond is relatively stronger."

- The nitrogen molecule (N2) has a triple bond (N≡N), which is one of the strongest bonds in chemistry. This strong bond makes nitrogen relatively stable and less reactive compared to phosphorus.

### Step 3: Analyze the Relationship Between A and R
- Statement A claims that phosphorus is more reactive, while Statement R explains that nitrogen has a strong triple bond, which contributes to its stability and lower reactivity.
- Since phosphorus is less stable in its molecular form (P4) due to angular strain and weaker single bonds, it is indeed more reactive than nitrogen.

### Step 4: Conclusion
- **A is true**: Phosphorus is more reactive than nitrogen.
- **R is true**: The N≡N bond is indeed stronger than the bonds in P4.
- However, R does not directly explain why A is true; it merely provides context about nitrogen's stability.

### Final Answer
- Both A and R are true, but R is not the correct explanation of A. Therefore, the correct option is that A is true and R is true, but R is not the correct explanation of A.