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 following groups contains only electrophiles, we need to analyze each option based on the definition of electrophiles. Electrophiles are species that are electron-seeking, meaning they are electron-deficient and can either have a positive charge or vacant orbitals to accept electrons.

### Step-by-Step Solution:

1. **Understanding Electrophiles**:
- Electrophiles are defined as electron-seeking species. They are typically electron-deficient, which means they can have a positive charge or vacant orbitals that can accept electrons.

2. **Analyzing Each Option**:
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