RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    Ethanal forms 3-hydroxy butanal on reaction with alkali. This reaction is

    A)  Claisen condensation

    B)  Polymerization

    C)  Aldol condensation

    D)  Reimer-Tiemann reaction

    Correct Answer: C

    Solution :

     \[\underset{acetaldehyde}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-H}}\,+C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-H\xrightarrow[{}]{Alkali}\] \[\underset{3-hydroxy\text{ }butanal}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-H}}\,\] This is aldol condensation reaction.


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