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Practical Organic Chemistry Test - 8

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Practical Organic Chemistry Test - 8
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Which of the following separation techniques is used to separate a mixture of acetone and methanol?

    Solution

    Boiling points of acetone (56oC) and methanol (65oC) differ by 9oC, and hence can be separated only by fractional distillation.

     

  • Question 2
    1 / -0

    A mixture of o-hydroxyacetophenone and p-hydroxyacetophenone can be conventionally purified by

    Solution

    Because of the intramolecular hydrogen bonding, o-hydroxyacetophenone exists as discrete molecules, while p-hydroxyacetophenone exists as associated molecules. Consequentely, o-hydroxyacetophenone is steam volatile, but p-hydroxyacetophenone is not.

     

  • Question 3
    1 / -0

    When thiourea is heated with metallic sodium, which of the following compounds is/are obtained?

    a. NaCNS
    b. NaCN
    c. Na2S
    d. Na2SO4

    Solution

    Thiourea contains both N and S. Hence, depending upon the amount of sodium used, NaCNS, NaCN and Na2S are formed, but Na2SO4 is not.

     

  • Question 4
    1 / -0

    Which of the following liquids are taken in Schiff's nitrometer in Duma's method?

    Solution

    In Duma's method, N2 is collected by the downward displacement of KOH solution and Hg is used as a seal.

     

  • Question 5
    1 / -0

    The compounds CH3CH=CH2 and cyclohexane have the same

    Solution

    These compounds have the same general formula, hence the percentage composition of their elements is also the same.

     

  • Question 6
    1 / -0

    Two organic compounds A and B, on analysis, gave the same percentage composition of C atoms and H atoms, i.e. 1 : 1. However, compound A decolourises bromine water, while compound B does not. These two compounds A and B may be

    Solution

    According to the question, the empirical formula of the compounds is CH. Compound A decolourises bromine water, but B does not. Therefore, A is C2H2 (acetylene) and B is C6H6 (benzene).

     

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