12th Class Chemistry Alcohols, Phenols and Ethers / एल्कोहॉल, फीनॉल तथा ईथर Question Bank 12th CBSE Chemistry Alcohols, Phenols and Ethers

  • question_answer
    On reacting tertiary butyl alcohol and normal butyl alcohol separately with a few drops of dilute \[KMn{{O}_{4}},\]purple colour disappears and a brown precipitate is formed only in one case. Which of the two alcohols will respond to the reaction?

    Answer:

                    Only n-butyl alcohol is oxidised under the reaction conditions while tertiary butyl alcohol fails to react. \[\underset{\begin{smallmatrix}   \\  \text{n-butyl}\,\text{alcohol} \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}OH}}\,+\underset{\begin{smallmatrix}   \\  \text{(Purple)} \end{smallmatrix}}{\mathop{KMn{{O}_{4}}}}\,\]\[\xrightarrow{\,}\underset{\begin{smallmatrix}   \\  Pot.\,salt\,of\,n-butyric\,acid \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}COOK}}\,+\underset{\begin{smallmatrix}   \\  Brown\,\,ppt. \end{smallmatrix}}{\mathop{Mn{{O}_{2}}+KOH}}\,\]


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