Question:
Phenol is more acidic than alcohol because:
Phenol is more acidic than alcohol because:
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Stable conjugate base = Stronger acid. Resonance "spreads" the charge, making phenoxide very stable.
Updated On: May 5, 2026
- O$-$H bond is weaker
- Phenoxide ion is resonance stabilised
- Phenol is a solid
- Higher molecular weight
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Acidity depends on the stability of the conjugate base formed after losing a proton ($H^{+}$).
Step 2: Meaning
When phenol loses $H^{+}$, it forms the phenoxide ion ($C_{6}H_{5}O^{-}$). Alcohols form alkoxide ions ($RO^{-}$).
Step 3: Analysis
In the phenoxide ion, the negative charge on oxygen is delocalized over the benzene ring through resonance, making it highly stable. Alkoxide ions have no such stabilization.
Step 4: Conclusion
The increased stability of the phenoxide ion drives phenol to release its proton more readily than alcohols. Final Answer: (B)
Acidity depends on the stability of the conjugate base formed after losing a proton ($H^{+}$).
Step 2: Meaning
When phenol loses $H^{+}$, it forms the phenoxide ion ($C_{6}H_{5}O^{-}$). Alcohols form alkoxide ions ($RO^{-}$).
Step 3: Analysis
In the phenoxide ion, the negative charge on oxygen is delocalized over the benzene ring through resonance, making it highly stable. Alkoxide ions have no such stabilization.
Step 4: Conclusion
The increased stability of the phenoxide ion drives phenol to release its proton more readily than alcohols. Final Answer: (B)
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