Select electrophiles out of the following :
`H^(+), Na^(+), Cl^(-), C_(2)H_(5)OH, AlCl_(3), SO_(3), CN^(-), CH_(3)CH_(2)^(+), : C Cl_(2), R-X`

Explanation

To determine which species from the given list are electrophiles, we need to identify those that are electron-deficient and can accept electrons. Here’s a step-by-step solution:

### Step 1: Understanding Electrophiles
Electrophiles are species that are electron-deficient and can accept an electron pair from a nucleophile during a chemical reaction. Common examples include cations and molecules with vacant orbitals.

### Step 2: Analyzing Each Species
1. **H⁺**: This is a proton and is electron-deficient. It can accept electrons. **(Electrophile)**
2. **Na⁺**: Although it has a positive charge, sodium has a complete octet and does not readily accept electrons. **(Not an electrophile)**
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