Question:
Which of the following is the most acidic carboxylic acid:
Which of the following is the most acidic carboxylic acid:
Show Hint
More Carbon chains = More +I effect = Less Acidic. Formic is the simplest and strongest.
Updated On: May 25, 2026
- Formic acid
- Butanoic acid
- Acetic acid
- Propanic acid
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Concept
The acidity of carboxylic acids is influenced by the inductive effect of the attached alkyl groups.
Step 2: Meaning
Alkyl groups have a +I (electron-donating) effect, which destabilizes the carboxylate anion and decreases acidity.
Step 3: Analysis
Formic acid (HCOOH) has only a hydrogen atom attached. Acetic, Propanoic, and Butanoic acids have methyl, ethyl, and propyl groups respectively, which decrease acidity via the +I effect.
Step 4: Conclusion
Formic acid is the strongest acid among the given options because it lacks electron-donating alkyl groups. Final Answer: (A)
The acidity of carboxylic acids is influenced by the inductive effect of the attached alkyl groups.
Step 2: Meaning
Alkyl groups have a +I (electron-donating) effect, which destabilizes the carboxylate anion and decreases acidity.
Step 3: Analysis
Formic acid (HCOOH) has only a hydrogen atom attached. Acetic, Propanoic, and Butanoic acids have methyl, ethyl, and propyl groups respectively, which decrease acidity via the +I effect.
Step 4: Conclusion
Formic acid is the strongest acid among the given options because it lacks electron-donating alkyl groups. Final Answer: (A)
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