Which of the following statements is wrong?

Options

A. Single N-N bond is stronger than the single P-P bond.
B. `PH_(3)` can act as a ligand in the formation of coordination compound with transition elements.
C. `NO_(2)` is paramagnetic in nature.
D. Covalency of nitrogen in `N_(2)O_(5)` is four.

Explanation

To determine which statement is wrong, we will analyze each of the given options one by one.

### Step-by-Step Solution:

1. **Option 1: Single nitrogen-nitrogen bond is stronger than single phosphorus-phosphorus bond.**
- The nitrogen-nitrogen (N-N) bond is actually weaker than the phosphorus-phosphorus (P-P) bond. This is due to the greater non-bonding electron repulsion in the N2 molecule compared to the P2 molecule. Therefore, this statement is **incorrect**.

2. **Option 2: PH3 can act as ligands in the formation of coordination compounds with a transition element.**
- PH3 has a lone pair of electrons that can be donated to a transition metal, allowing it to act as a ligand. This statement is **correct**.

3. **Option 3: NO2 is paramagnetic in nature.**
- The NO2 molecule has unpaired electrons in its molecular orbital configuration, which makes it paramagnetic. This statement is **correct**.

4. **Option 4: Covalency of nitrogen in N2O5 is 4.**
- In N2O5, nitrogen can form multiple bonds (double bonds) with oxygen, leading to a total of four bonds for each nitrogen atom. Thus, this statement is also **correct**.

### Conclusion:
The only incorrect statement among the options is **Option 1**, which claims that the single nitrogen-nitrogen bond is stronger than the single phosphorus-phosphorus bond.

### Final Answer:
The wrong statement is **Option 1**.