JEE Main & Advanced AIEEE Solved Paper-2005

  • question_answer The   best   reagent   to   convert pent-S-en-2-ol into pent-3-en-2-one is     AIEEE  Solved  Paper-2005

    A) pyridinium chioro-chromate

    B) chromic anhydride in glacial acetic acid

    C) acidic dichromate

    D) acidic permanganate

    Correct Answer: B

    Solution :

    \[C{{H}_{3}}-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\overset{{{2}^{o}}}{\mathop{CH}}}\,-CH=CH-C{{H}_{3}}\xrightarrow{{}}\] \[C{{H}_{3}}-\underset{\begin{smallmatrix}  ||\, \\  O \end{smallmatrix}}{\overset{{}}{\mathop{CH}}}\,-CH=CH-C{{H}_{3}}\] Only suitable reagent is chromic anhydride in glacial acetic acid Pyridinium chloro chromate gives aldehyde. Other two will also effect \[(C=C)\]bond.


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