The given dissociation constant (Ka) value 1.3 x 10^-10 is of_________________?
Correct answer: D. Phenol
- A. Alcohol
- B. Acetic acid
- C. Water
- D. Phenol
Explanation
Phenol is a weak acid with Ka approximately 1.3 x 10^-10, because the phenoxide ion formed after losing H+ is stabilised by resonance. Acetic acid is much stronger and has Ka about 1.8 x 10^-5, so choosing acetic acid confuses the relative acid strengths.
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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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