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JEE Main & Advanced Chemistry Aldehydes, Ketones Question Bank Mock Test - Aldehydes, Ketones and Carboxylic Acids

  • question_answer
    Acetaldehyde on warming with Fehling solution gives a red precipitate of

    A) Elemental copper

    B) Cuprous oxide

    C) Cupric oxide      

    D) Mixture of all of the above

    Correct Answer: B

    Solution :

    [b] Aldehyde on warming with Fehling solution give a red precipitate of cuprous oxide. \[RCHO+2Cu{{(OH)}_{2}}+NaOH\to RCOONa+\underset{red\,ppt}{\mathop{C{{u}_{2}}O}}\,+3{{H}_{2}}O\]


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