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

  • question_answer
    When rectified spirit and benzene are distilled together, the first fraction obtained is

    A)                 A ternary azeotrope      

    B)                 Absolute alcohol

    C)                 A binary azeotrope        

    D)                 Denatured spirit

    Correct Answer: A

    Solution :

               Azeotropic distillation method ?            Rectified spirit + Benzene + water                         ¯ Fractional distillation First fraction at 331.8 K is ternary azeotrope (\[{{H}_{2}}O\] 7.4% + Benzene 74% + alcohol 18.5%)            Second fraction 341.2 K is a binary azeotrope (Benzene 67.7% + Alcohol 32.2%)                                 Last fraction at 351K is absolute alcohol.


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