`HClO_(4),HNO_(3)` and `HCl` are all strong acids in aqueous solution.In glacial acetic acid medium, their acid strength is such that-

Options

A. `HClO_4 gt HCl gt NHO_3`
B. `NHO_3 gt HClO_4 gt HCl `
C. `HCl gt HClO_6 gt NHO_3`
D. `HCl gt HClO_4 gt NHO_3`

Answer

To determine the order of acid strength of HClO₄, HNO₃, and HCl in glacial acetic acid, we need to analyze their behavior in this less polar medium compared to water.

### Step-by-Step Solution:

1. **Understanding Acid Strength in Aqueous Solution**:
- In aqueous solution, the order of strength for these acids is:
- HNO₃ (strongest) > HCl > HClO₄ (weakest).
- This order is based on their ability to donate protons (H⁺ ions) in water.

2. **Analyzing Glacial Acetic Acid**:
- Glacial acetic acid is a weak acid and is less polar than water. This means it does not dissociate into ions as readily as water does.
- The lower polarity affects the ionization of strong acids, which can lead to a change in their relative strengths.

3. **Effect of Polarity on Acid Strength**:
- In a less polar medium, the ability of an acid to donate protons can change. The acids may not ionize as effectively.
- The order of acid strength can reverse in a less polar solvent.

4. **Determining the New Order**:
- In glacial acetic acid, the order of acid strength changes due to the factors mentioned:
- HClO₄ becomes the strongest acid because it can still donate protons effectively despite the medium's lower polarity.
- HCl follows as the second strongest.
- HNO₃ becomes the weakest in this medium.

5. **Final Order of Acid Strength in Glacial Acetic Acid**:
- Thus, the order of acid strength in glacial acetic acid is:
- HClO₄ > HCl > HNO₃.

### Conclusion:
The correct order of acid strength in glacial acetic acid is HClO₄ > HCl > HNO₃.