Which of the following statement 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 among the given options, we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement 1:** The single N-N bond is stronger than the single P-P bond.

- **Analysis:** The N-N bond is weaker than the P-P bond. This is because nitrogen has a smaller atomic size, leading to greater electron-electron repulsion between the two nitrogen atoms. Therefore, the bond strength is reduced. In contrast, phosphorus has a larger atomic size, resulting in less repulsion and a stronger bond.

**Conclusion:** This statement is incorrect.

### Step 2: Analyze the second statement
**Statement 2:** PH3 can act as a ligand in the formation of a coordination compound with transition elements.

- **Analysis:** PH3 has a lone pair of electrons that can be donated to transition metals, allowing it to act as a Lewis base and form coordination compounds. Therefore, this statement is correct.

**Conclusion:** This statement is correct.

### Step 3: Analyze the third statement
**Statement 3:** NO2 is paramagnetic in nature.

- **Analysis:** NO2 has an unpaired electron, which makes it paramagnetic. This is due to the presence of an odd number of electrons in its molecular structure. Therefore, this statement is correct.

**Conclusion:** This statement is correct.

### Step 4: Analyze the fourth statement
**Statement 4:** The covalency of nitrogen in N2O5 is 4.

- **Analysis:** In N2O5, nitrogen forms four bonds: two double bonds with oxygen and one coordinate bond. Covalency is defined as the number of bonds formed by an atom. Therefore, the covalency of nitrogen in N2O5 is indeed 4.

**Conclusion:** This statement is correct.

### Final Conclusion
After analyzing all the statements, we find that the first statement is the only incorrect one.

**Answer:** The wrong statement is the first one: "The single N-N bond is stronger than the single P-P bond."

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