Which one of the following contains the most Acidic proton?
Correct answer: A. Thiol
- A. Thiol
- B. Alcohol
- C. Phenol
- D. Ether
Explanation
Thiol (R-SH) typically contains the most acidic proton. This is because the sulfur atom in thiol is less electronegative than oxygen in alcohols, making it more willing to donate a proton. The presence of the sulfur atom also stabilizes the resulting thiolate anion through resonance, further enhancing the acidity.
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About Phenols
Phenols contain a hydroxyl group directly bonded to an aromatic ring, making them more acidic than alcohols because the phenoxide ion is resonance-stabilised. Reactions include ionisation with bases, electrophilic substitution, bromination, nitration and oxidation, with attention to the difference between phenols and aliphatic alcohols.
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