JEE Main & Advanced Chemistry Aldehydes, Ketones Question Bank Properties

  • question_answer
    To distinguish between formaldehyde and acetaldehyde, we require                                     [Orissa PMT 1987]

    A)                 Tollen's reagent               

    B)                 Fehling's solution

    C)                 Schiff's reagent

    D)                 Caustic soda solution

    Correct Answer: D

    Solution :

               \[2HCHO\underset{Conc.}{\mathop{\xrightarrow{NaOH}}}\,C{{H}_{3}}OH+HCOONa\]            It is a Cannizzaro?s reaction.                    \[2C{{H}_{3}}CHO\underset{dil}{\mathop{\xrightarrow{NaOH}}}\,C{{H}_{3}}-\overset{OH}{\mathop{\overset{|\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-CHO\]                                 It is aldol condensation reaction.


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