Write correct order of acidic strength of following compounds:
`(a) Cl - CH_(2) - overset(O)overset(||)C- O - H " "(b) Cl - underset(Cl)underset(|)CH - overset(O)overset(||)C- O - H `
(c)`Cl - underset(Cl)underset(|)overset(Cl)overset(|)C- overset(O)overset(||)C- O - H `

Answer

To determine the correct order of acidic strength of the given compounds, we need to analyze their conjugate bases after the removal of the acidic hydrogen (H⁺) from each compound. The stability of these conjugate bases will help us establish the order of acidity.

### Step-by-Step Solution:

1. **Identify the Compounds**:
- (a) Cl-CH₂-C(=O)-OH
- (b) Cl₂CH-C(=O)-OH
- (c) Cl₃C-C(=O)-OH

2. **Remove the Acidic Hydrogen**:
- For each compound, we will remove the hydrogen from the hydroxyl (OH) group to form the conjugate bases:
- (a) Cl-CH₂-C(=O)-O⁻
- (b) Cl₂CH-C(=O)-O⁻
- (c) Cl₃C-C(=O)-O⁻

3. **Analyze the Conjugate Bases**:
- The stability of the conjugate bases is influenced by the electron-withdrawing effects of the chlorine atoms (Cl) attached to the carbon chain.
- The more stable the conjugate base, the stronger the corresponding acid.

4. **Stability of Conjugate Bases**:
- **Compound (a)**: Has one Cl, which provides a -I (inductive) effect, stabilizing the negative charge on the oxygen to some extent.
- **Compound (b)**: Has two Cl atoms, which enhance the -I effect, leading to greater stabilization of the negative charge on the conjugate base.
- **Compound (c)**: Has three Cl atoms, providing the strongest -I effect, which significantly stabilizes the negative charge on the conjugate base.

5. **Order of Acidity**:
- Since the stability of the conjugate bases increases with the number of Cl atoms, we can conclude:
- (c) has the most stable conjugate base, thus it is the strongest acid.
- (b) is next, with moderate stability.
- (a) has the least stability and is the weakest acid.
- Therefore, the order of acidic strength is:
- **C > B > A**

### Final Answer:
The correct order of acidic strength is: **C > B > A**