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JEE Main levelSingle correct optionDifficulty 2 of 3nm142

The number of carboxylic acid structural isomers of is

  1. A4
  2. B3
  3. C5
  4. D6

Answer: A

The acid is and the butyl group has 4 structural forms: pentanoic acid, 2-methylbutanoic acid, 3-methylbutanoic acid and 2,2-dimethylpropanoic acid. That makes 4.
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