Question:
Which among the following is the strongest acid?
Which among the following is the strongest acid?
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Rule:
More electron withdrawing groups $\rightarrow$ Stronger acid
Updated On: May 8, 2026
- Acetic acid
- Monochloroacetic acid
- Dichloroacetic acid
- Trichloroacetic acid
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept: Acidity of carboxylic acids increases with electron withdrawing groups (-I effect).
• $-\text{Cl}$ is strongly electron withdrawing.
• More number of Cl atoms $\rightarrow$ greater stabilization of conjugate base $\rightarrow$ stronger acid.
Step 1: Compare compounds.
• Acetic acid: No $-\text{Cl}$
• Monochloroacetic acid: 1 Cl
• Dichloroacetic acid: 2 Cl
• Trichloroacetic acid: 3 Cl
Step 2: Trend. \[ \text{Acidity: } \text{CCl}_3\text{COOH} > \text{CHCl}_2\text{COOH} > \text{CH}_2\text{ClCOOH} > \text{CH}_3\text{COOH} \]
Step 3: Conclusion.
Trichloroacetic acid is strongest. Final Answer: Option (D)
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