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JEE Main levelSingle correct optionDifficulty 2 of 3g1007

Which of the following is the strongest acid?

  1. Apropanoic acid
  2. B2,2-dichloropropanoic acid
  3. C3-chloropropanoic acid
  4. D2-chloropropanoic acid

Answer: B

A -I substituent stabilises the carboxylate more when it is closer and when there are more of them. 2,2-Dichloropropanoic acid has two Cl atoms on the carbon adjacent to , so it is the strongest acid.
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