JEE Main & Advanced Chemistry Hydrocarbons Question Bank Aromatic Hydrocarbon

  • question_answer Which of the following yield both alkane and alkene [AFMC 2004]

    A) Kolbe?s reaction

    B) Williamson?s synthesis

    C) Wurtz reaction

    D) Sandmeyer reaction

    Correct Answer: A

    Solution :

               Kolbe?s methods - Electrolysis of a concentrated aqueous solution of either sodium or potassium salts of saturated mono carboxylic acids yields higher alkanes at anode.                    \[C{{H}_{3}}COONa\]⇌ \[C{{H}_{3}}CO{{O}^{-}}+Na+\]                    Anode : \[2C{{H}_{3}}CO{{O}^{-}}\xrightarrow{-2{{e}^{-}}}C{{H}_{3}}-C{{H}_{3}}+2C{{O}_{2}}\]                    Cathode : \[2N{{a}^{+}}+2{{e}^{-}}\to 2Na\] \[2Na+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}\]

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