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

  • question_answer
    Which of the following alcohols reacts most readily with Lucas reagent?

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

    B) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\  OH \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{3}}\]

    C) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\  C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix}  C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-OH\]

    D) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\  C{{H}_{3}} \end{smallmatrix}}{\mathop{CH}}\,-C{{H}_{2}}OH\]

    Correct Answer: C

    Solution :

    The rate of reaction with Lucas reagent is \[3{}^\circ >2{}^\circ >\text{ }1{}^\circ \]. Tertiary alcohols immediately react to give turbidity, secondary alcohols after some time and primary alcohols do not give turbidity until heated.


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