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Aldehydes And Ketones Test - 27

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Aldehydes And Ketones Test - 27
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  • Question 1
    1 / -0

    A typical compound undergoes Cannizzaro's reaction as well as aldol condensation. The possible compound is

    Solution

    Certain aliphatic monoalylated aldehydes having α-hydrogen atom show aldol condensation as well as Cannizzaro reaction when heated with aqueous NaOH at 150-200°C

     

  • Question 2
    1 / -0

    The difference between aldol condensation and Cannizzaro's reaction is that

    Solution

    Aldol condensation: recation takes place in presence of α-H-atom

    Cannizzaro's reaction: recation takes place in absence of α-H-atom

     

  • Question 3
    1 / -0

    Aldol condensation between the following comounds followed by dehydration gives methyl vinyl ketone

    Solution

     

  • Question 4
    1 / -0

    The product(s) obtained via oxymercuration (HgSO4+H2SO4) of 1-butyne would be

    Solution

     

  • Question 5
    1 / -0

    The most reactive compound towards formation of cyanohydrin on treatment with KCN followed by acidification is:

    Solution

    Due to electron withdrawing nature of NO2​ group, the partial positive charge on the carbon atom of the C=O group in p-nitrobenzaldehyde increases and becomes more susceptible to nucleophilic attack by the CN− ion.

     

  • Question 6
    1 / -0

    Which of the following has most acidic proton?

    Solution

    Proton of active methylene group is acidic in nature.

    has two electron withdrawing groups around -CH2 - which make it active methyl group

     

  • Question 7
    1 / -0

    Self condensation of acetaldehyde, in the presence of dilute alkalis gives

    Solution

    The self-condensation of acetaldehyde in the presence of dilute alkalies is called aldol condensation.

     

  • Question 8
    1 / -0

    Acetaldehyde and acetone can be distinguished by

    Solution

    Acetaldehyde on heating with Tollen's reagent give silver mirror test while acetone is not oxidised by Tollen's reagent (ketons oxidies only under drastic condition).

     

  • Question 9
    1 / -0

    Aniline reacts with which of these to form Schiff's base?

    Solution

     

  • Question 10
    1 / -0

    Formaldehyde on condensation in presence of Ca(OH)2​ gives

    Solution

    Formose or α-acrose, is an isomer of glucose and fructose.

     

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