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Alcohols Test - 10
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Alcohols Test - 10
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  • Question 1/9
    1 / -0.25

     

    Which reaction(s) given below gives dicarbonyl?

     

    Solutions

     

     

    Syn vicinal diols undergo oxidative cle avage with HIO4 giving diols, Option (b) and option (c) are anti diol and have restricted rotation.

     

     

  • Question 2/9
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    In the following rearrangement, possible product(s) is/are

     

    Solutions

     

     

    It is a Pinacol-pinacolone rearrangement.

    (I) on deprotonation gives (a) while (II) on deprotonation gives (b).

     

     

  • Question 3/9
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    Which reaction(s) given below gives glycerol? 

     

    Solutions

     

     




     

     

  • Question 4/9
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    In the following rearrangement, reaction possible product(s) is/are

     

    Solutions

     

     

    Pinacol-pinacolone rearrangemen

    Deprotonation of (I) gives (a) while deprotonation of (II) gives (c).

     

     

  • Question 5/9
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    Comprehension Type

    Direction : This section contains a paragraph, describing theory, experiments, data, etc. Three questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Glycol when heated with concentrated H2 SO4 , undergo a variety of reactions as


    Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

    Q. 

    Which is most likely to undergo intermolecular dehydration to give dioxane or substituted dioxane?

     

    Solutions

     

     

    Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.

    The diol is not tertiary, hence more likely to form dioxane.

     

     

  • Question 6/9
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    Glycol when heated with concentrated H2 SO4 , undergo a variety of reactions as


    Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

    Q. 

    Which of the following is most likely to undergo Pinacol-pinacolone rearrangement?

     

    Solutions

     

     

    Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.
    It is tertiary diol, undergo Pinacol-pinacolone rearrangeme.

     

     

  • Question 7/9
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    Glycol when heated with concentrated H2 SO4 , undergo a variety of reactions as


    Nature of predominant product depends upon the nature of other groups present at the two α-carbons.

    Q. 

    Which diol given below is most likely to form diene in the above reaction?

     

    Solutions

     

     

    Vicinal diols which is not tertiary, prefer to form dioxane while tertiary diols prefer to undergo Pinacol-pinacolone rearrangement.

     

     

  • Question 8/9
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    Matching List Type

    Direction : Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q.

    Match the reactant from Column I with the reaction(s) from Column II and mark the correct option from the codes given below.


     

    Solutions

     

     







     

     

  • Question 9/9
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    Match the compounds in Column I with their reaction and product(s) in Column II and mark the correct option from the codes given below.

     

     

    Solutions

     

     

    (i) It is a symmetrical, 3 ° diol, gives (CH3 )2 CO with HIO4 , a single pinacolone (CH3 )3 C —COCH3 and a single cyclic a mine :

    (ii) With HIO4 gives (CH3 )2CO and (C6 H5 )2 CO. (ii) is unsymmetrical, 3 °diol, gives more than one pinacolone in rearrangement reaction. However it gives a single cyclic amine.

    (iii) with HIO4 gives a single ketone-acetophenone. It gives two different pinacolone in rearrangement reaction.

    (iv) It is unsymmetrical, 3 °diol, gives two different ketones with HIO4 and more than one pinacolone in rearrangement reaction.

     

     

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