Question:
The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II), and 3-hydroxybenzaldehyde (III) is:
The correct acidity order of phenol (I), 4-hydroxybenzaldehyde (II), and 3-hydroxybenzaldehyde (III) is:
Updated On: Jan 29, 2026
- I<II<III
- I<III<II
- II<I<III
- III<I<II
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The Correct Option is B
Solution and Explanation
Phenol is acidic due to the resonance stabilization of the phenoxide ion. The introduction of an electron-withdrawing group such as -CHO increases acidity by stabilizing the negative charge on the oxygen atom.
- 4-Hydroxybenzaldehyde (II): The -CHO group at the para position exerts the maximum electron-withdrawing effect due to resonance and inductive effects, making II the most acidic.
- 3-Hydroxybenzaldehyde (III): The -CHO group at the meta position provides a lesser electron-withdrawing effect compared to the para position, making III less acidic than II but more acidic than I.
- Phenol (I): Without any substituents, phenol has the lowest acidity among the three compounds.
Therefore, the acidity order is I<III<II.
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