Which of the following series contains only electrophiles?

Options

A. `H_(2)O,SO_(3),H_(3)O^(+)`
B. `CH_(3)-CONH_(2)`
C. `CH_(3)CH_(2)OH`
D. `CH_(3)CH=CH_(2)`

Answer

To determine which of the given series contains only electrophiles, we need to analyze each option based on the definition of electrophiles. Electrophiles are species that can accept electrons and typically do not have a negative charge or lone pairs of electrons.

### Step-by-Step Solution:

1. **Analyze Option A: H2O, SO2, H3O+**
- **H2O (Water)**: Contains two lone pairs on oxygen. Therefore, it is not an electrophile.
- **SO2 (Sulfur Dioxide)**: Sulfur has a vacant p-orbital, but oxygen has lone pairs. This means SO2 can act as an electrophile, but the presence of lone pairs on oxygen complicates its classification.
- **H3O+ (Hydronium Ion)**: Has a positive charge and can act as an electrophile.
- **Conclusion**: This option contains both nucleophiles (H2O) and electrophiles (H3O+), so it is not the correct answer.

2. **Analyze Option B: CH3, CO, NH2**
- **CH3 (Methyl Group)**: This is a carbocation (if considered as CH3+) and can act as an electrophile.
- **CO (Carbon Monoxide)**: While it can act as a ligand, it does not fit the typical definition of an electrophile.
- **NH2 (Amino Group)**: Contains a lone pair and acts as a nucleophile.
- **Conclusion**: This option contains nucleophiles (NH2) and does not consist solely of electrophiles.

3. **Analyze Option C: CH3, CH2, OH**
- **CH3 (Methyl Group)**: This is a stable alkyl group and does not act as an electrophile.
- **CH2 (Methylene Group)**: This is also not an electrophile.
- **OH (Hydroxyl Group)**: Contains a lone pair on oxygen and acts as a nucleophile.
- **Conclusion**: This option contains nucleophiles (OH) and is not the correct answer.

4. **Analyze Option D: CH3, CH, double bond CH2**
- **CH3 (Methyl Group)**: This is a stable alkyl group.
- **CH (Allylic Position)**: This carbon has a vacant p-orbital and can act as an electrophile.
- **CH2 (Vinyl Group)**: The double bond can stabilize a positive charge, making it an electrophile as well.
- **Conclusion**: This option does not contain any lone pairs or negative charges, and thus consists solely of electrophiles.

### Final Answer:
The series that contains only electrophiles is **Option D: CH3, CH, double bond CH2**.

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