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JEE Main levelSingle correct optionDifficulty 2 of 3si044

The single reagent that distinguishes methanal from ethanal is

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

Answer: A

Ethanal contains and gives yellow , whereas methanal is oxidised to formate and gives no iodoform. Both aldehydes reduce Tollens and Fehling and both give 2,4-DNP derivatives.
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