JEE Main & Advanced Chemistry Aldehydes, Ketones Question Bank Properties

  • question_answer
    A mixture of benzaldehyde and formaldehyde on heating with aqueous \[NaOH\] solution gives [IIT-JEE (Screening) 2001]

    A)                 Benzyl alcohol and sodium formate

    B)                 Sodium benzoate and methyl alcohol

    C)                 Sodium benzoate and sodium formate

    D)                 Benzyl alcohol and methyl alcohol

    Correct Answer: A

    Solution :

               Crossed aldol reaction gives benzyl alcohol and sodium formate. \[\underset{\text{Benzaldehyde}}{\mathop{{{C}_{6}}{{H}_{5}}CHO}}\,\,+\underset{\text{Formaldehyde}}{\mathop{HCHO}}\,\xrightarrow{NaOH\,(aq)}\]\[\underset{\text{Benzyl}\,\text{alcohol}}{\mathop{{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH}}\,\,+\underset{\text{Sod}\text{.}\,\text{formate}}{\mathop{HCOONa}}\,\]


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