Aqueous solution of which of the following compounds is the best conductor of electric current?

Options

A. Acetic acid , `C_(2)H_(4)O_(2)`
B. Hydrochloric acid , HCl
C. Ammonia , `NH_(3)`
D. Fructose , `C_(6)H_(12)O_(6)`

Explanation

To determine which aqueous solution among the given compounds is the best conductor of electric current, we need to analyze the nature of each compound in terms of its ability to dissociate into ions when dissolved in water. The conductivity of an aqueous solution is directly proportional to the number of ions present in that solution.

Here’s the step-by-step solution:

### Step 1: Identify the Compounds
The compounds given are:
1. Acetic acid (CH₃COOH)
2. Hydrochloric acid (HCl)
3. Ammonia (NH₃)
4. Fructose (C₆H₁₂O₆)

### Step 2: Determine the Nature of Each Compound
- **Acetic acid**: This is a weak acid and a weak electrolyte. It partially dissociates in water to produce ions (CH₃COO⁻ and H⁺), but not to a significant extent.

- **Hydrochloric acid (HCl)**: This is a strong acid and a strong electrolyte. It completely dissociates in water to produce a large number of ions (H⁺ and Cl⁻).

- **Ammonia (NH₃)**: This is a weak base and a weak electrolyte. It partially ionizes in water to produce ammonium ions (NH₄⁺) and hydroxide ions (OH⁻), but again, not to a significant extent.

- **Fructose**: This is a sugar and does not dissociate into ions in solution. It is a non-electrolyte.

### Step 3: Compare the Ion Production
- **Fructose**: No ions produced (non-electrolyte).
- **Acetic acid**: Produces few ions (weak electrolyte).
- **Ammonia**: Produces few ions (weak electrolyte).
- **Hydrochloric acid**: Produces many ions (strong electrolyte).

### Step 4: Conclusion
Since HCl is a strong electrolyte and dissociates completely in water to produce a large number of ions, it will be the best conductor of electric current among the given options.

### Final Answer
The aqueous solution of **Hydrochloric acid (HCl)** is the best conductor of electric current.

---