JEE Main & Advanced Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank Alkene

  • question_answer
    Dilute aqueous \[KMn{{O}_{4}}\], at room temperature reacts with \[\text{ }R-CH=CH-R\]to give [Roorkee 1992]

    A) R - CHO

    B) R - COOH

    C) RCHOH - CHOHR

    D) \[C{{O}_{2}}+{{H}_{2}}O\]

    Correct Answer: C

    Solution :

      \[R-CH=CH-R\underset{\text{room temp}\text{.}}{\mathop{\xrightarrow{\text{dil}\text{. aqueous }KMn{{O}_{4}}}}}\,\underset{(\text{Alcohol)}}{\mathop{R-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{CH}}\,-\underset{\begin{smallmatrix}  | \\  OH \end{smallmatrix}}{\mathop{CH}}\,\,-R}}\,\] \[R-CH=CH-R\underset{\text{heat}}{\mathop{\xrightarrow{\text{Conc}\text{. }KMn{{O}_{4}}}}}\,R-COOH+R-COOH\]


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