Which of the following is the weakest acid?
Correct answer: B. Ethanol
- A. Carboxylic acid
- B. Ethanol
- C. Phenol
- D. Ethyne
Explanation
Acid strength decreases as pka increases, and ethyne has the highest pka (-25) among the options. This means it donates protons the least easily, making it the weakest acid. Ethanol, phenol, and carboxylic acids are all significantly stronger acids than ethyne.
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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