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Aldehydes, Ketones and Carboxylic Acids Test - 7

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Aldehydes, Ketones and Carboxylic Acids Test - 7
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  • Question 1
    4 / -1

     

    Which is the major product in the following reaction?

     

    Solution

     

     

     

     

  • 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? 

     

    Solution

     

     

    An α-βC—C bond is always formed in aidol 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?

     

    Solution

     

     

    Nucleophilic addition at carbonyl carbon of cyclopropane releases angle strain.

     

     

  • Question 4
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    In the following reaction,

    The major organic product is 

     

    Solution

     

     

     

     

  • Question 5
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    Consider the following aldol condensation reaction,

    Q.

    The nucleophile is

     

    Solution

     

     

    In acid catalysed aldo! condensation, enol acts as a nucleophile.

     

     

  • Question 6
    4 / -1

     

    In the following reaction,

    Q. 

    The major final product is

     

    Solution

     

     


    Repeated aidol condensation occur due to very high reactivity of formaldehyde towards nucleophile.

     

     

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

     

    Solution

     

     


     

     

  • Question 8
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    The incorrect statement regarding aldol condensation is

     

    Solution

     

     

    Enolate is formed in first fast step which undergo nucleophilic addition in second slow step.

     

     

  • Question 9
    4 / -1

     

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

     

    Solution

     

     


    It is an α, β-unsaturated ketone which can be formed in an aldol condensation followed by dehydration.

     

     

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

     

    Solution

     

     

     

     

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

     

    Solution

     

    In carbonyl bonds b/w O and C, C is electrophilic centre(centre which needs electron as it is deficient in it) and O is nucleophilic centre(centre which needs +ve charge as it has excess charge).  Also, C=O bond is polarised with O having partial negative charge and C having partial positive charge.

  • Question 12
    4 / -1

     

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

     

    Solution

    The Isomers of C3H6O include:


    Hence we can see that a total of 11 isomers of C3H6O are possible.

     

  • Question 13
    4 / -1

     

    What is the common name of 2-methyl-propanal?

     

    Solution

     

    Isobutyraldehyde is the chemical compound with the formula (CH₃)₂CHCHO.

    It is an aldehyde, isomeric with n-butyraldehyde.

    Isobutyraldehyde is manufactured, often as a side-product, by the hydroformylation of propene. Its odour is described as that of wet cereal or straw.

     

  • Question 14
    4 / -1

     

    Write the IUPAC name of (CH3)2CHCHO?

     

    Solution

    The IUPAC name of (CH3)2CHCHO is 2-methylpropanal and its chemical name is Isobutyraldehyde.

     

  • Question 15
    4 / -1

     

    Acetone and Propanal are

     

    Solution

    Acetone (CH3COCH3) and Propanal (CH3CH2CHO) are functional isomers.

    Acetone:

     

  • 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.

     

    Solution

     

     

    Reversibility of aldol into carbonyls establishes that carbanion nucleophile is formed in first fast reversible step.

     

     

  • 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.

     

    Solution

     

     

    It would be true only if both carbonyls are capable of forming enolates, i.e. possesses α-H

     

     

  • Question 18
    4 / -1

     

    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.

     

    Solution

     

     

     

     

  • 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.

     

    Solution

     

     

    Both self-aldol of cyclohexanone (although minor one) and cross aldol are formed.

     

     

  • 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

     

    Solution

     

     

    Reversing the final product gives

     

     

  • Question 21
    4 / -1

     

    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

     

    Solution

     

     

     

     

  • Question 22
    4 / -1

     

    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 ?

     

    Solution

     

     

     

     

  • 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?

     

    Solution

     

     

     

  • Question 24
    4 / -1

     

    Consider the following cross-aldol condensation reaction,


    Q. 

    How many different isomeric X are formed?

     

    Solution

     

     

  • 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?

     

    Solution

     

    All three hydrogen can be deprotonated from nitromethane giving

  • Question 26
    4 / -1

     

    Consider the following sequence of reaction, 

    Q. 

    How many different aldol isomers of X are formed?

     

    Solution

     

     

  • Question 27
    4 / -1

     

    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?

     

    Solution

     

     

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