Species which are isoelectronic with `OF_(2)` are

Options

A. `CIO^(Theta)`
B. `CIF`
C. `CIO_(3)`
D. `CIO_(2)`

Explanation

To determine the species that are isoelectronic with OF₂, we need to follow these steps:

### Step 1: Determine the total number of electrons in OF₂
- **Oxygen (O)** has an atomic number of 8, which means it has 8 electrons.
- **Fluorine (F)** has an atomic number of 9, meaning each fluorine atom has 9 electrons. Since there are 2 fluorine atoms in OF₂, the total contribution from fluorine is \(2 \times 9 = 18\) electrons.
- Therefore, the total number of electrons in OF₂ is:
\[ \text{Total electrons in OF₂} = 8 \, (\text{from O}) + 18 \, (\text{from 2 F}) = 26 \, \text{electrons} \]

### Step 2: Identify species that have 26 electrons
Now we need to check various species to see if they have a total of 26 electrons.

1. **ClO⁻ (Chlorine monoxide anion)**
- Chlorine (Cl) has 17 electrons.
- Oxygen (O) has 8 electrons.
- The negative charge indicates that there is one additional electron.
- Total electrons in ClO⁻:
\[ 17 \, (\text{from Cl}) + 8 \, (\text{from O}) + 1 \, (\text{extra electron}) = 26 \, \text{electrons} \]

2. **ClF (Chlorine monofluoride)**
- Chlorine (Cl) has 17 electrons.
- Fluorine (F) has 9 electrons.
- Total electrons in ClF:
\[ 17 \, (\text{from Cl}) + 9 \, (\text{from F}) = 26 \, \text{electrons} \]

3. **ClO₃ (Chlorine trioxide)**
- Chlorine (Cl) has 17 electrons.
- Each oxygen (O) has 8 electrons, and there are 3 oxygen atoms.
- Total electrons in ClO₃:
\[ 17 \, (\text{from Cl}) + (3 \times 8) \, (\text{from 3 O}) = 17 + 24 = 41 \, \text{electrons} \]
- This is not isoelectronic with OF₂.

4. **ClO₂ (Chlorine dioxide)**
- Chlorine (Cl) has 17 electrons.
- Each oxygen (O) has 8 electrons, and there are 2 oxygen atoms.
- Total electrons in ClO₂:
\[ 17 \, (\text{from Cl}) + (2 \times 8) \, (\text{from 2 O}) = 17 + 16 = 33 \, \text{electrons} \]
- This is also not isoelectronic with OF₂.

### Conclusion
The species that are isoelectronic with OF₂ (having 26 electrons) are:
- ClO⁻
- ClF

### Final Answer
The correct isoelectronic species with OF₂ are ClO⁻ and ClF.