Which one of the following organic acids is the most reactive and the strongest acid?
Correct answer: A. HCOOH
- A. HCOOH
- B. CH3COOH
- C. CH3CH2COOH
- D. CH3CH2CH2COOH
Explanation
Option A is correct.Formic acid is the simplest carboxylic acid. It has a pKa value of 3.75, which is the lowest among the given acids. The pKa value is a measure of the acidity of a molecule. A lower pKa value means that the molecule is more acidic. The other acids have the following pKa values: CH3COOH: pKa = 4.76 CH3CH2COOH: pKa = 5.07 CH3CH2CH2COOH: pKa = 4.89 As you can see, the pKa value of formic acid is lower than the pKa values of the other acids. This means that formic acid is more acidic than the other acids. Formic acid is more reactive than the other acids because it has a smaller size and a more electronegative carbon atom. The smaller size of formic acid makes it more likely to react with other molecules. The more electronegative carbon atom of formic acid makes it more likely to donate a proton to other molecules.
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