The strongest acid among the following is?
Correct answer: D. Butanoic acid
- A. Carbolic acid
- B. H2O
- C. Methanol
- D. Butanoic acid
Explanation
OPTION A: Carbolic acid is a weak organic acid with a pKa of around 10. It is a slightly acidic compound and is a weaker acid than water.OPTION B: Water is a neutral compound with a pH of 7, but it can act as a weak acid in certain solutions. This is due to the presence of Hydronium ions (H3O+) that form when water dissolves in acidic solutions.OPTION C: Methanol is a weak organic acid with a pKa of around 15. It is a weaker acid than water and phenol.OPTION D: Butanoic acid is a stronger organic acid with a pKa of around 4.5. It is a stronger acid than water, phenol, and methanol.
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About Alcohols and Phenols
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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535 free Alcohols and Phenols MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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