Order of stability of halogen oxides :-

Options

A. `I lt Cl lt Br`
B. `I gt Cl gt Br`
C. `I lt Cl gt Br`
D. `I gt Cl lt Br`

Answer

To determine the order of stability of halogen oxides (I2O, Cl2O, and Br2O), we can follow these steps:

### Step 1: Identify the Halogen Oxides
The halogen oxides we are considering are:
- I2O (iodine oxide)
- Cl2O (chlorine oxide)
- Br2O (bromine oxide)

### Step 2: Understand the Nature of Bonds
Halogen oxides are covalent in nature. This is due to the small difference in electronegativities between the halogens and oxygen, which allows them to form covalent bonds.

### Step 3: Analyze the Trend in Stability
As we move down the group in the periodic table from chlorine to bromine to iodine, the size of the halogen atoms increases. This increase in size leads to an increase in covalent character of the bonds formed.

### Step 4: Consider the Formation of Multiple Bonds
Chlorine (in Cl2O) can form multiple bonds with oxygen due to the presence of empty d-orbitals. This ability to form multiple bonds enhances the stability of Cl2O compared to Br2O, which cannot form such bonds effectively.

### Step 5: Compare the Stability of the Oxides
Based on the above points:
- I2O is expected to be the most stable due to the larger size of iodine allowing for a more stable covalent bond.
- Cl2O is more stable than Br2O because chlorine can form multiple bonds with oxygen.
- Br2O is the least stable among these oxides.

### Conclusion
Thus, the order of stability of halogen oxides is:
1. I2O (most stable)
2. Cl2O
3. Br2O (least stable)

### Final Answer
The correct order of stability is: **I2O > Cl2O > Br2O**.

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