Most stable tri halides of nitrogen :-

Options

A. `NCl_(3)`
B. `NF_(3)`
C. `NBr_(3)`
D. `NI_(3)`

Answer

To determine the most stable trihalide of nitrogen, we need to analyze the stability of the nitrogen halides: NF3, NCl3, NBr3, and NI3.

### Step 1: Identify the Halides
The nitrogen trihalides we are considering are:
- NF3 (Nitrogen trifluoride)
- NCl3 (Nitrogen trichloride)
- NBr3 (Nitrogen tribromide)
- NI3 (Nitrogen triiodide)

### Step 2: Understand the Trends in Stability
The stability of these compounds can be influenced by several factors, including the size of the halogen atoms and their electronegativity.

### Step 3: Analyze the Halogens
- **Fluorine (F)**: Smallest size, highest electronegativity.
- **Chlorine (Cl)**: Larger than fluorine, lower electronegativity.
- **Bromine (Br)**: Larger than chlorine, even lower electronegativity.
- **Iodine (I)**: Largest size, lowest electronegativity.

### Step 4: Compare the Bond Characteristics
As we move down the group from fluorine to iodine, the size of the halogen atoms increases, which affects the bond strength:
- The N-F bond in NF3 is strong due to the small size and high electronegativity of fluorine.
- The N-Cl, N-Br, and N-I bonds are weaker because the halogen atoms are larger and less electronegative.

### Step 5: Conclusion on Stability
Given that NF3 has the strongest bond due to the small size and high electronegativity of fluorine, it is more stable compared to NCl3, NBr3, and NI3. Therefore, the most stable trihalide of nitrogen is NF3.

### Final Answer
The most stable trihalide of nitrogen is **NF3**.

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