RAJASTHAN ­ PET Rajasthan PET Solved Paper-2006

  • question_answer
    A chiral centre produces in the reaction \[C{{H}_{3}}CHO+HCN\xrightarrow[{}]{{}}C{{H}_{3}}CH(OH)CN\] The product will be

    A)  meso compound  

    B)  racemic mixture

    C)  Leavorotatory    

    D)  dextrorotatory

    Correct Answer: B

    Solution :

     \[C{{H}_{3}}-\underset{\begin{smallmatrix}  || \\  O \end{smallmatrix}}{\mathop{C}}\,-H+HCN\xrightarrow[{}]{{}}\underset{d\text{ }and\text{ I}-form}{\mathop{C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\overset{\begin{smallmatrix}  CN \\  | \end{smallmatrix}}{\mathop{C}}}\,-H}}\,\] The product consists a asymmetric carbon atom hence it presents in 50% dextrorotatory and 50% leavorotatory forms and therefore product will be a racemic mixture.


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