NEET2025Chemistry-Acidity of Carboxylic Acids
NEET 2025 Chemistry Aliphatic Acids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The correct order of decreasing acidity of the following aliphatic acids is :
A
(CH₃)₃CCOOH > (CH₃)₂CHCOOH > CH₃COOH > HCOOH
B
CH₃COOH > (CH₃)₂CHCOOH > (CH₃)₃CCOOH > HCOOH
C
HCOOH > CH₃COOH > (CH₃)₂CHCOOH > (CH₃)₃CCOOH
D
HCOOH > (CH₃)₃CCOOH > (CH₃)₂CHCOOH > CH₃COOH
Correct Answer
Option C
Detailed Explanation
Acidity decreases with increasing alkyl substitution due to the electron-donating effect of alkyl groups. Thus, formic acid (HCOOH) is the most acidic, followed by acetic acid (CH₃COOH), then isopropanoic acid ((CH₃)₂CHCOOH), and finally tert-butanoic acid ((CH₃)₃CCOOH).
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