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Aldehydes, Keto...

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  • Question 1
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    Which is the major product in the following reaction?

     

  • Question 2
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    Consider the following reaction,

    Q. 

    Which of the labeiled C—C bond formation is not possible in the above reaction? 

     

  • Question 3
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    In a mixed aldoi condensation with ethanal as one aidehyde, which other from the following is expected to give maximum yield of cross condensation product?

     

  • Question 4
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    In the following reaction,

    The major organic product is 

     

  • Question 5
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    Consider the following aldol condensation reaction,

    Q.

    The nucleophile is

     

  • Question 6
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    In the following reaction,

    Q. 

    The major final product is

     

  • Question 7
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    Identify the starting reagent needed to make the following compound by mixed aldol condensation.

     

  • Question 8
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    The incorrect statement regarding aldol condensation is

     

  • Question 9
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    Which of the following could result as a product in the aldol condensation reaction?

     

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

     

  • Question 11
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    Which of the following statements are correct in case of the carbonyl bond between carbon and oxygen?

     

  • Question 12
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    How many structural isomers can compound with molecular formula ‘C3H6O’ have?

     

  • Question 13
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    What is the common name of 2-methyl-propanal?

     

  • Question 14
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    Write the IUPAC name of (CH3)2CHCHO?

     

  • Question 15
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    Acetone and Propanal are

     

  • Question 16
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    Statement Type

    Direction (Q. Nos. 16-19) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Statement I : In aldol condensation, enoiates are nucleophilic and reversibly attack the carbonyl carbon of aldehyde or ketone in the aldoi condensation.

    Statement II : An aldoi on refluxing with dilute base gives back the carbonyl compound.

     

  • Question 17
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    Statement I : When a mixture of ethanal and propanal is treated with aqueous Na2CO3, four aldol (excluding stereoisomers) are formed.
    Statement II : In mixed aldol condensation, two self and two cross condensation products are always formed.

     

  • Question 18
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    Statement I : When   is treated with dilute base.
      is formed.

    Statement II : In the given compound, γ-H is most acidic, forms the required enolate.

     

  • Question 19
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    Statement I : In the reaction below,

    A single aldol product is formed in 100% yield.

    Statement II : Cross aldol product is formed as major product.

     

  • 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

    A is optically active and C is one of the several aldol possible in the above reaction.

    Q. 

    The structure of A satisfying above criteria is

     

  • Question 21
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    A is optically active and C is one of the several aldol possible in the above reaction.

    Q. 

    Besides C, the other six membered cyclic aldol formed in the above reaction is

     

  • Question 22
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    A is optically active and C is one of the several aldol possible in the above reaction.

    Q. 

    The product B is stereomeric. If a mixture containing all stereoisomers of B is treated with excess of LiAIH4 followed by the acidification will give how many different isomeric diols ?

     

  • Question 23
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    Direction (Q. Nos. 23-27) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Consider the following aldol condensation reaction,

    Butanone + NaOH (Dil.) → Aldols

    Q. 

    How many different isomers (including stereoisomers) are formed above?

     

  • Question 24
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    Consider the following cross-aldol condensation reaction,


    Q. 

    How many different isomeric X are formed?

     

  • Question 25
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    Consider the following modified aldol condensation,

    Q. 

    How many ethanal, at the most, will react with one molecule of nitromethane?

     

  • Question 26
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    Consider the following sequence of reaction, 

    Q. 

    How many different aldol isomers of X are formed?

     

  • Question 27
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    Consider the following sequence of reaction,


    Q. 

    If all undehydrated aldols (X) formed above by intramolecular aldol condensation are considered, how many pairs of enantiomers are formed?

     

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