Electrophiles are electron seeking species. Which of the following groups contain only electrophiles ?

Options

A. `BF_(3), NH_(3), H_(2)O`
B. `AlCl_(3), SO_(3), NO_(2)^(+)`
C. `NO_(2)^(+), CH_(3)^(+), CH_(3) - C^(+) = O`
D. `C_(2)H_(5)^(-), C_(2)H_(5), C_(2)H_(5)^(+)`

Explanation

To determine which of the provided groups contains only electrophiles, we need to analyze each option based on the definition of electrophiles. Electrophiles are species that seek electrons, meaning they are electron-deficient.

### Step-by-Step Solution:

1. **Understand Electrophiles**: Electrophiles are defined as electron-seeking species. They are typically positively charged or neutral species that can accept an electron pair.

2. **Analyze Each Option**:
- **Option 1: BF3, NH3, H2O**
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