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Carboxylic Acid...

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  • Question 1
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    One or More than One Options Correct Type

    Direction : This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

    Q. 

    Successful mixed aldol condensation will be favoured  

     

  • Question 2
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    Which of the following is/are true regarding aldol condensation ?

     

  • Question 3
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    Which of the following indicated carbon-carbon bond can be formed via intramolecular aldoi condensation of a dicarbonyl compound?

     

  • Question 4
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    Which compound (s) below can react via an intramolecular aldol  condensation to give a six membered ring?

     

  • Question 5
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    What is(are) true about the following aldoi reaction?

     

  • Question 6
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    Statement Type

    Direction : 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 7
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    Statement I : When a mixture of ethanal and propanal is treated with aqueous Na2 CO3 , four aldol  (excluding stereoisomers) are formed.
    Statement II : In mixed aldol  condensation, two self and two cross condensation products are always formed.

     

  • Question 8
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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 9
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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 10
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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

    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 11
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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 12
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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 13
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    One Integer Value Correct Type

    Direction : 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 14
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    Consider the following cross-aldol condensation reaction,


    Q. 

    How many different isomeric X are formed?

     

  • Question 15
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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 16
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    Consider the following sequence of reaction, 

    Q. 

    How many different aldol isomers of X are formed?

     

  • Question 17
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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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