Which statement is not correct about `NO_(2)` ?

Options

A. It is paramagnetic
B. It forms dimer and paramanetism is lost
C. It has one coordinate bond
D. It has nitrogen oxygen triple bond

Explanation

To determine which statement is not correct about \( NO_2 \), we can analyze the properties and bonding of the molecule step by step.

### Step 1: Understanding the Structure of \( NO_2 \)
- **Valence Electrons**: Nitrogen has 5 valence electrons, and each oxygen has 6 valence electrons. Therefore, in \( NO_2 \):
- Nitrogen contributes 5 electrons.
- Each oxygen contributes 6 electrons, totaling 12 from both oxygens.
- Total valence electrons = \( 5 + 12 = 17 \) electrons.

### Step 2: Drawing the Lewis Structure
- **Bonding**: In \( NO_2 \), nitrogen forms:
- One double bond with one oxygen (4 electrons).
- One single bond with the other oxygen (2 electrons).
- This accounts for 6 electrons used in bonding.
- **Lone Pairs**: The remaining electrons (11 electrons) are distributed as follows:
- Each oxygen has 3 lone pairs (6 electrons) and one oxygen has one unpaired electron.
- The nitrogen has one unpaired electron.

### Step 3: Determining the Electron Count
- **Total Electrons**: The total number of electrons in \( NO_2 \) is 17, which is an odd number. This confirms that \( NO_2 \) is an odd-electron species.

### Step 4: Paramagnetism
- **Unpaired Electrons**: Since \( NO_2 \) has an unpaired electron, it is paramagnetic. This means it can be attracted to a magnetic field.

### Step 5: Dimerization
- **Dimerization**: \( NO_2 \) can dimerize to form \( N_2O_4 \). In this process, the unpaired electrons pair up, resulting in a diamagnetic molecule.

### Step 6: Evaluating the Statements
Now, let's evaluate the statements provided in the question:
1. **It is paramagnetic** - This is correct.
2. **It forms a dimer and loses paramagnetism** - This is also correct.
3. **It has one coordinate bond** - This is correct as well.
4. **It has a nitrogen-oxygen triple bond** - This is incorrect. The bonding in \( NO_2 \) consists of one double bond and one single bond, not a triple bond.

### Conclusion
The statement that is not correct about \( NO_2 \) is that it has a nitrogen-oxygen triple bond.

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