Which of the following orders regarding acidic strength is correct

Options

A. `CH_(3)COOH gtCH_(3)CH_(2)OH gt CH-=CH`
B. `CH_(3)COOH gt CH-=CH gt CH_(3)CH_(2)OH`
C. `CH-=CH gt CH_(3)COOH gt CH_(3)CH_(2)OH`
D. `CH-=CH gt CH_(3)CH_(2)OH gt CH_(3)COOH`

Explanation

To determine the correct order of acidic strength among the given compounds, we need to analyze the stability of the conjugate bases formed after the acid donates a proton (H+). The more stable the conjugate base, the stronger the acid.

### Step-by-Step Solution:

1. **Identify the Acids and Their Conjugate Bases**:
- Let's denote the acids as follows:
- Acid A: CH3C(=O)OH (Acetic acid)
- Acid B: CH3CH2OH (Ethanol)
- Acid C: HC≡CH (Acetylene)
- Upon losing H+, the conjugate bases formed are:
- Conjugate Base A: CH3C(=O)O⁻ (Acetate ion)
- Conjugate Base B: CH3CH2O⁻ (Ethoxide ion)
- Conjugate Base C: HC≡C⁻ (Acetylide ion)

2. **Analyze the Stability of Conjugate Bases**:
- **Conjugate Base A (Acetate ion)**: The negative charge on the oxygen can be stabilized by resonance with the carbonyl group (C=O). This resonance delocalizes the negative charge, making it more stable.
- **Conjugate Base B (Ethoxide ion)**: The negative charge is localized on the oxygen atom. There is no resonance stabilization available, making it less stable than the acetate ion.
- **Conjugate Base C (Acetylide ion)**: The negative charge is on a carbon atom, which is less electronegative than oxygen. Therefore, it is less stable compared to the other two conjugate bases.

3. **Determine the Order of Acidity**:
- Since the stability of the conjugate bases is in the order:
- CH3C(=O)O⁻ (most stable)
- CH3CH2O⁻
- HC≡C⁻ (least stable)
- The corresponding order of acidity will be:
- CH3C(=O)OH > CH3CH2OH > HC≡CH

4. **Conclusion**:
- The correct order of acidic strength is:
- CH3C(=O)OH > CH3CH2OH > HC≡CH

### Final Answer:
The correct order regarding acidic strength is:
**CH3C(=O)OH > CH3CH2OH > HC≡CH**