Question:medium
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
Show Solution
The Correct Option is B
Solution and Explanation
Phenol's acidity stems from the resonance stabilization of its phenoxide ion. Adding an electron-withdrawing group like -CHO enhances acidity by stabilizing the oxygen's negative charge.
- 4-Hydroxybenzaldehyde (II): The para-positioned -CHO group maximizes electron withdrawal due to resonance and induction, making II the most acidic.
- 3-Hydroxybenzaldehyde (III): The meta-positioned -CHO group's electron withdrawal is weaker than at the para position, placing III between II and I in acidity.
- Phenol (I): Lacking substituents, phenol exhibits the lowest acidity.
Consequently, the acidity order is I<III<II.
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