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

  • question_answer
    Which of the following compound give yellow precipitate with \[{{I}_{2}}\] and NaOH    [Pb. CET 2003]

    A)                 \[C{{H}_{3}}OH\]             

    B)                 \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}OH\]

    C)                 \[{{C}_{2}}{{H}_{5}}O{{C}_{2}}{{H}_{5}}\]             

    D)                 \[C{{H}_{3}}C{{H}_{2}}OH\]

    Correct Answer: D

    Solution :

               Ethyl alcohol give positive iodoform test (i.e. yellow ppt. with \[{{I}_{2}}\] and NaOH)                    \[C{{H}_{3}}C{{H}_{2}}OH+4{{I}_{2}}+6NaOH\to \]\[\underset{\text{yellow ppt}\text{.}}{\mathop{CH{{I}_{3}}}}\,+5NaI+C{{H}_{3}}COONa+3{{H}_{2}}O\]


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