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JEE Main levelSingle correct optionDifficulty 2 of 3si019

Pentan-2-one and pentan-3-one can be distinguished by

  1. A
  2. B2,4-DNP
  3. CFehling's solution
  4. DTollens reagent

Answer: A

Pentan-2-one has a group and gives yellow iodoform with ; pentan-3-one has none and gives no precipitate. Both are ketones, so both give 2,4-DNP precipitates and both are negative with Tollens and Fehling.
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