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JEE MainChemistryAldehydes and Ketones

Which of the following pairs of compounds can be distinguished by using ammoniacal silver nitrate solution?

Options

  1. AAcetaldehyde and Benzaldehyde
  2. BFormic acid and Acetic acid
  3. CFormaldehyde and Formic acid
  4. DAcetone and Benzophenone

Correct answer

B. Formic acid and Acetic acid

Step-by-step solution

To distinguish a pair of compounds using a specific reagent, one compound must give a positive test while the other gives a negative test. Ammoniacal silver nitrate (Tollens' reagent) is a mild oxidizing agent that oxidizes aldehydes and formic acid, resulting in a silver mirror. Let us evaluate each pair: 1) Acetaldehyde (aliphatic aldehyde) and Benzaldehyde (aromatic aldehyde): Both give a positive Tollens' test. Cannot be distinguished. 2) Formic acid and Acetic acid: Formic acid contains an aldehydic hydrogen a

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