JEE Main & Advanced Chemistry Hydrocarbons / हाइड्रोकार्बन Question Bank Alkene

  • question_answer
    A gas formed by the action of alcoholic KOH on ethyl iodide, decolorises alkaline \[KMn{{O}_{4}}\] solution. The gas is [CPMT 1974, 91; MP PET 1985; IIT-JEE 1982]

    A) \[C{{H}_{4}}\]

    B) \[{{C}_{2}}{{H}_{6}}\]

    C) \[{{C}_{2}}{{H}_{4}}\]

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

    Correct Answer: C

    Solution :

    \[C{{H}_{3}}C{{H}_{2}}I+KOH\,(alc)\to C{{H}_{2}}=C{{H}_{2}}+KI+{{H}_{2}}O\] \[C{{H}_{2}}=C{{H}_{2}}+\underset{\begin{matrix}    \,  \\    \begin{matrix}    \text{Alk}\text{. Pink}  \\    {}  \\ \end{matrix}  \\ \end{matrix}}{\mathop{KMn{{O}_{4}}}}\,\xrightarrow{{{H}_{2}}O}\underset{\text{Colourless}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{OH\,}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,-\underset{OH\,}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\,+Mn{{O}_{2}}}}\,\]


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