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Aldehydes, Keto...

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  • Question 1
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    In hexane-2,4-dione, how many different mono-enols are possible?

  • Question 2
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    What is the correct order of equilibrium enol content of the following compounds?

    I. CH3COCH3
    II. CH3COCH2COOC2H5
    III. CH3COCH2COCH3
    IV. CH3COCH2COH

  • Question 3
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    In which of the following compounds, enol form exist? 

  • Question 4
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    Among the following compounds, one that will not show keto-enol tautomerism is

  • Question 5
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    Arrange the following in the increasing order of hydrate content at equilibrium in aqueous solution

    I. H2CO

    III. C6H5CHO

  • Question 6
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    For which of the following equilibrium, Kc < 1 ?

  • Question 7
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    Arrange the following in the increasing order of stability of their most stable enol.

  • Question 8
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    Which of the following observation does not establish the existence of keto-enol tautomerism in acetone?

  • Question 9
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    Hemiacetals are usually unstable whereas acetals are stable. Which has the most stable hemiacetal?

  • Question 10
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    Which form s most stable acetal in the given condition? 

  • Question 11
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    Consider the following reaction,

    Q.

    The appropriatensequence of reagent that can best bring about the above conversion is

  • Question 12
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    What is the major product in the following reaction?

  • Question 13
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    Which of the following has greater enol content than keto counter part?

  • Question 14
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    Arrange the following in the increasing order of acidic strength 

    I. H2CO
    II. CH3CHO
    III. C6H5CH2CHO

  • Question 15
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    Which reagent given below can differentiate propanal from propanone?

  • Question 16
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    Which is the most suitable reagent for the following transformation?

  • Question 17
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    Give the name of the following compound:

  • Question 18
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    The compound formed as a result of oxidation of ethyl benzene by KMnO4 is

  • Question 19
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    Which of the following is correct?

  • Question 20
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    Comprehension Type

    Direction (Q. Nos. 20-22) 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

    In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
    Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

    Q. 

    The major final product in the following reaction is

     

  • Question 21
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    In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
    Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

    Q. 

    How the following transformation can be best brought about?

     

  • Question 22
    4 / -1

    In general, ketones are less reactive than aldehydes in nucleophilic addition reaction, for both steric and electronic reasons.
    Hence, if a keto-aldehyde is treated with nucleophilic reagent, reaction occur first at aldehyde group.

    Consider the following reaction,

    Q. 

    Major product is 

  • Question 23
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    Direction (Q. Nos. 23-26) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

    How many different enols exist for 4-methyl-3- hexanone ?

  • Question 24
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    If all the mono and dienols are considered, how many enols are possible for 2,4-pentanedione?

     

  • Question 25
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    If butanone is treated with D2O18/DCI, isotopic exchange occur. What maximum gain in molecular mass is possible in the present case?

     

  • Question 26
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    When acetaldehyde is treated with catalytic amount of H2SO4, a stable association product X is formed. How many lone pair of electrons are present in XI

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