Self Studies

Aldehydes, Keto...

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  • Question 1
    4 / -1

    Arrange the following in the increasing order of reactivity with NH3.

    I. CH2O
    II. CH3CHO
    III. CH3—CO—CH3

     

  • Question 2
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    The major organic product formed in the following reaction is

  • Question 3
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    Which carbonyl compound below gives the reddish orange precipitate with 2, 4-dinitrophenyl hydrazine? 

  • Question 4
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    Which carbonyl compound below forms a single semicarbazone when allowed to react with semicarbazide?

  • Question 5
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    A hydrocarbon X (C7H14) on ozonolysis followed by work-up with Zn- H2O gives C6H12O as one of the product which on subsequent treatment with KOH/I2 gives yellow precipitate and salt of a chiral acid. Hence, X could be

  • Question 6
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    Which gives more than one oximes on treatment with hydroxylamine?

  • Question 7
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    Which forms an unsaturated amine on treatment with cyclopentanone in slightly acidic medium? 

  • Question 8
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    Consider the following reaction,

    Q. 

    X (major) in the above reaction is

  • Question 9
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    What is the final major product Y in the following reaction?

  • Question 10
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    What is the final major product in the following reaction?

  • Question 11
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    Heating a mixture of sodium benzoate and soda lime gives

  • Question 12
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    Formic acid and acetic acid are distinguished by reaction with

  • Question 13
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    The reaction of ethyl formate with an excess of CH3MgI followed by hydrolysis gives

  • Question 14
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    An inorganic compound producing an organic compound on heating is

  • Question 15
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    Comprehension Type

    Direction (Q. Nos. 15-17) 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

    Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows


    The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
    However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

    Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

    Q. 

    What happens if imine form ation is carried out at very low pH?

  • Question 16
    4 / -1

    Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows


    The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
    However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

    Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

    Q. 

    Which of the following is expected to give more than one imine when treated with CH3NH2?

  • Question 17
    4 / -1

    Aidehydes and ketones react with ammonia and primary amines to form imines in slightly acidic condition. A typical reaction mechanism with a primary amine is as follows


    The proper pH control is crucial to imine formation otherwise reaction does not proceed at appreciable rate.
    However, if a secondary amine is reacted, no hydrogen is left on nitrogen on intermediate (I) for the deprotonation in step II. Hence, the reaction proceeds as

    Enamine is a suitable intermediate route for α-alkyiation of a carbonyl compound.

    Q. 

    What is the product X in the following reaction?

  • Question 18
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    One Integer Value Correct Type

    Direction (Q. Nos. 18-21) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

     In the following reaction, how many isomers of trioximes are formed?

     

  • Question 19
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    Consider the isomeric aldehydes with molar mass 100, if all the isomers (only structural) are treated independently with NH2OH, how many of them would give more than two stereomeric oximes?

     

  • Question 20
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    When formaldehyde reacts with ammonia, a typical compound called hexamethylene tetramine is formed. How many six membered rings are present in this compound?

     

  • Question 21
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    The smallest acyclic ketone that gives pair of diastereomers with CH3NH2 in slightly acidic medium has how many carbon atoms?

     

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