Which of the following is relatively stronger acid?

Options

A. `H_(2)S`
B. HCN
C. HF
D. `CH_(3)COOH`

Answer

To determine which of the given compounds is a relatively stronger acid, we will analyze each option based on their acidic strength.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We have four compounds to consider:
- H₂S (Hydrogen Sulfide)
- HCN (Hydrocyanic Acid)
- HF (Hydrofluoric Acid)
- CH₃COOH (Acetic Acid)

2. **Understand Acid Strength**:
The strength of an acid is determined by its ability to donate protons (H⁺ ions). Stronger acids dissociate more completely in solution.

3. **Analyze Each Compound**:
- **H₂S**: This is a weak acid. It partially dissociates in water to form H⁺ and HS⁻ ions.
- **HCN**: This is known to be a very weak acid. It dissociates to a much lesser extent than H₂S.
- **HF**: Hydrofluoric acid is a weak acid but is stronger than H₂S and HCN. It can dissociate in water, but it does not fully ionize.
- **CH₃COOH**: Acetic acid is also a weak acid, but it is weaker than HF. It partially dissociates in water to form H⁺ and CH₃COO⁻ ions.

4. **Compare the Acids**:
- Among H₂S, HCN, HF, and CH₃COOH, HF is known to be the strongest acid due to the high electronegativity of fluorine, which stabilizes the negative ion formed after dissociation.
- H₂S is weaker than HF but stronger than HCN and CH₃COOH.

5. **Conclusion**:
Based on the analysis, HF (Hydrofluoric Acid) is the relatively stronger acid among the given options.

### Final Answer:
**HF (Hydrofluoric Acid) is the relatively stronger acid.**

---