JEE Main & Advanced Chemistry Alcohols, Phenols and Ethers / एल्कोहॉल, फीनॉल तथा ईथर Question Bank Preparation of alcohol Phenol and Ethers

  • question_answer
    Ethanol is prepared industrially by            [MP PMT 1989]

    A)                 Hydration of ethylene  

    B)                 Fermentation of sugars

    C)                 Both the above

    D)                 None of these

    Correct Answer: C

    Solution :

               Hydration of alkenes            \[C{{H}_{2}}=C{{H}_{2}}+\overset{+}{\mathop{H}}\,HS{{\overset{-}{\mathop{O}}\,}_{4}}\to C{{H}_{3}}-C{{H}_{2}}-HS{{O}_{4}}\]            \[C{{H}_{3}}-C{{H}_{2}}HS{{O}_{4}}\underset{Boil}{\mathop{\xrightarrow{{{H}_{2}}O}}}\,C{{H}_{3}}-C{{H}_{2}}-OH+{{H}_{2}}S{{O}_{4}}\]            Fermentation of sugars: \[{{C}_{12}}{{H}_{22}}{{O}_{11}}+{{H}_{2}}O\xrightarrow{\text{Invertase}}\underset{\text{Glucose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,+\underset{\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\]                 \[\underset{\text{Glucose}\,\,\text{or}\,\text{Fructose}}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6}}}}\,\xrightarrow{\text{Zymase}}\,2{{C}_{2}}{{H}_{5}}OH+2C{{O}_{2}}\]


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