Question:
The carboxylic acid with highest $pK_a$ and lowest $pK_a$ values of the following respectively are:
The carboxylic acid with highest $pK_a$ and lowest $pK_a$ values of the following respectively are:
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Electron-withdrawing groups decrease \(pK_a\), increasing acidity; electron-donating groups increase \(pK_a\), decreasing acidity.
Updated On: Jan 6, 2026
- I, II
- I, IV
- III, II
- III, IV
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The Correct Option is D
Solution and Explanation
The carboxylic acid with electron-donating group (III, methyl) has the highest \(pK_a\) (weakest acid), and that with strong electron-withdrawing group (IV, nitro) has the lowest \(pK_a\) (strongest acid).
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