Which of the following sets of groups contains only electrophiles?

Options

A. `NH_(2)^(-),NO_(2)^(+),H_(2)O,NH_(3)`
B. `F^(-),OH^(-),NH_(3),SO_(3)`
C. `NO_(2)^(+),AlCl_(3),SO_(3),CH_(3)overset(+)(C)=O`
D. `NH_(3),BF_(3),AlCl_(3),H_(2)O`

Explanation

To determine which set of groups contains only electrophiles, we need to analyze each group and identify whether they are electrophiles or nucleophiles.

### Step-by-Step Solution:

1. **Understanding Electrophiles**:
- Electrophiles are species that are electron-deficient and can accept electron pairs. They are often positively charged or neutral species with an incomplete octet.

2. **Analyzing the Groups**:
- **Group A**: NH2−, NO2+, H2O, NH3
- **NH2−**: This is a nucleophile because it has a lone pair of electrons on nitrogen, making it electron-rich.
- **NO2+**: This is an electrophile. The nitrogen has a positive charge and is electron-deficient.
- **H2O**: This is a nucleophile due to the presence of lone pairs on oxygen.
- **NH3**: This is also a nucleophile because it has a lone pair on nitrogen.
- **Conclusion for A**: Contains nucleophiles and one electrophile (NO2+), so it is not the answer.

3. **Group B**: F−, OH−, NH3, SO3
- **F−**: This is a nucleophile because it has a full octet and is electron-rich.
- **OH−**: This is a nucleophile due to the presence of lone pairs on oxygen.
- **NH3**: This is a nucleophile because it has a lone pair on nitrogen.
- **SO3**: This is an electrophile; sulfur is bonded to three electronegative oxygen atoms, creating a positive charge on sulfur.
- **Conclusion for B**: Contains nucleophiles and one electrophile (SO3), so it is not the answer.

4. **Group C**: NO2, AlCl3, SO3, C=O (with CH3)
- **NO2**: This is an electrophile due to the positive charge on nitrogen.
- **AlCl3**: This is an electrophile because aluminum can accept a lone pair due to its vacant p-orbital.
- **SO3**: This is an electrophile for the same reasons discussed previously.
- **C=O (with CH3)**: This is also an electrophile because the carbonyl carbon is electron-deficient and can accept electrons.
- **Conclusion for C**: All species in this group are electrophiles.

5. **Group D**: NH3, H2O, CH3COOH, SO3
- **NH3**: This is a nucleophile.
- **H2O**: This is a nucleophile.
- **CH3COOH**: This is a weak acid and can act as a nucleophile due to the presence of lone pairs on oxygen.
- **SO3**: This is an electrophile.
- **Conclusion for D**: Contains nucleophiles and one electrophile (SO3), so it is not the answer.

### Final Answer:
The correct option that contains only electrophiles is **Group C**: NO2, AlCl3, SO3, C=O (with CH3).

---