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

  • question_answer
    During dehydration of alcohols to alkenes by heating with conc.\[{{H}_{2}}S{{O}_{4}}\] the initiation step is         [AIEEE 2003]

    A)                 Protonation of alcohol molecule

    B)                 Formation of carbocation

    C)                 Elimination of water

    D)                 Formation of an ester

    Correct Answer: A

    Solution :

               \[{{H}_{2}}S{{O}_{4}}\to {{H}^{+}}+HSO_{4}^{-}\]                                 \[{{C}_{2}}{{H}_{5}}OH+{{H}^{+}}\underset{\text{of}\,\,\text{alcohol}}{\mathop{\xrightarrow{\text{Protonation}}}}\,\underset{\text{Protonated alcohol}}{\mathop{{{C}_{2}}{{H}_{5}}-\underset{H}{\mathop{\underset{\downarrow }{\overset{\oplus }{\mathop{O}}}\,}}\,-H}}\,\]


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