Total number of electrophiles present in the following are
`NO_(2)^(+), SO_(3), CN^(-), F^(-), C Cl_(4), NH_(3), , :C Cl_(2)`.

Answer

To determine the total number of electrophiles from the given species, we need to analyze each one based on their electron deficiency. Electrophiles are species that are electron-deficient and can accept electrons. Let's evaluate each species step-by-step:

1. **NO₂⁺ (Nitronium ion)**:
- This species has a positive charge, indicating that it is electron-deficient.
- It can accept electrons from electron-rich species.
- **Conclusion**: NO₂⁺ is an electrophile.

2. **SO₃ (Sulfur trioxide)**:
- In SO₃, the sulfur atom is bonded to three electronegative oxygen atoms, which creates a partial positive charge on sulfur.
- This positive character makes SO₃ electron-deficient.
- **Conclusion**: SO₃ is an electrophile.

3. **CN⁻ (Cyanide ion)**:
- The cyanide ion carries a negative charge, indicating that it is electron-rich.
- Since it can donate electrons, it acts as a nucleophile rather than an electrophile.
- **Conclusion**: CN⁻ is not an electrophile.

4. **F⁻ (Fluoride ion)**:
- Similar to CN⁻, the fluoride ion has a negative charge, making it electron-rich.
- It can also donate electrons, thus acting as a nucleophile.
- **Conclusion**: F⁻ is not an electrophile.

5. **CCl₄ (Carbon tetrachloride)**:
- In CCl₄, the carbon atom is fully bonded to four chlorine atoms, and there are no charges present.
- This species is stable and does not exhibit electron deficiency.
- **Conclusion**: CCl₄ is not an electrophile.

6. **NH₃ (Ammonia)**:
- Ammonia has a lone pair of electrons on the nitrogen atom, making it capable of donating electrons.
- Therefore, it acts as a nucleophile.
- **Conclusion**: NH₃ is not an electrophile.

7. **CCl₂ (Dichlorocarbene)**:
- CCl₂ has a carbon atom that is bonded to two chlorine atoms and has a vacant p-orbital, making it electron-deficient.
- This species can accept electrons and react with electron-rich species.
- **Conclusion**: CCl₂ is an electrophile.

Now, let's summarize the findings:
- Electrophiles identified: NO₂⁺, SO₃, CCl₂
- Total number of electrophiles = 3

### Final Answer:
The total number of electrophiles present is **3**.