Which of these molecules have non-bonding electron pairs on the central atom?
`I. SF_(4)" "II. ICl_(3)" " III. SO_(2)`
The correct option is :

Options

A. (a) II only
B. (b) I and II only
C. (c) I and III only
D. (d) I, II and III

Explanation

To determine which of the given molecules have non-bonding electron pairs on the central atom, we will analyze each molecule one by one.

### Step 1: Analyze SF₄
- **Valence Electrons**: Sulfur (S) has 6 valence electrons, and each Fluorine (F) has 7 valence electrons.
- **Bonding**: In SF₄, sulfur forms 4 single bonds with 4 fluorine atoms.
- **Lone Pairs**: After forming these bonds, sulfur will have 6 - 4 = 2 valence electrons left, which will form 1 lone pair.
- **Conclusion**: SF₄ has 1 non-bonding electron pair on the central atom (sulfur).

### Step 2: Analyze ICl₃
- **Valence Electrons**: Iodine (I) has 7 valence electrons, and each Chlorine (Cl) has 7 valence electrons.
- **Bonding**: In ICl₃, iodine forms 3 single bonds with 3 chlorine atoms.
- **Lone Pairs**: After forming these bonds, iodine will have 7 - 3 = 4 valence electrons left, which will form 2 lone pairs.
- **Conclusion**: ICl₃ has 2 non-bonding electron pairs on the central atom (iodine).

### Step 3: Analyze SO₂
- **Valence Electrons**: Sulfur (S) has 6 valence electrons, and each Oxygen (O) has 6 valence electrons.
- **Bonding**: In SO₂, sulfur forms 2 double bonds with 2 oxygen atoms.
- **Lone Pairs**: After forming these bonds, sulfur will have 6 - 4 = 2 valence electrons left, which will form 1 lone pair.
- **Conclusion**: SO₂ has 1 non-bonding electron pair on the central atom (sulfur).

### Final Conclusion
All three molecules (SF₄, ICl₃, and SO₂) have non-bonding electron pairs on their central atoms.

### Answer
The correct option is: **All of the above (I, II, III)**.

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