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Haloalkanes & Haloarenes Test - 6
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Haloalkanes & Haloarenes Test - 6

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  • Question 1/10
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    Only One Option Correct Type

    Direction (Q. Nos. 1-5) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

    Q. 

    What is the major alkene product in the following reaction?

    Solutions

  • Question 2/10
    1 / -0.25

    Which of the following gives 1-butene as the major product most easily on heating with AgOH?

    Solutions


  • Question 3/10
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    1-butene would be formed most easily in the following reaction when X is

    Solutions

    Rate of reaction in E2 reaction depends on acidity of β—H as well as steric hindrance at β-carbon. When X is F, acidity is maximum and there is less steric hindrance at less substituted β-carbon.

  • Question 4/10
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    Which of the following compound is most likely to follow E1 cb mechanism when treated with C2 H5 ONa in ethanol?

    Solutions

    It forms resonance stabilised carbanion after abstraction of β—H hence, favours the most to E1cb mechanism.

  • Question 5/10
    1 / -0.25

    Consider the following reaction and the product formed.

    Q. 

    The most likely mechanism of the above reaction is

    Solutions


    Above equilibrium can explain the formation of given product, hence reaction must proceed by E1 cb mechanism

  • Question 6/10
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    One or More than One Options Correct Type

    Direction (Q. Nos. 6-8) This section contains 3 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

    Q. 

    Which of the following gives methanol as the major product when heated with AgOH?

     

    Solutions

     

     

    All these lacks β—H undergo SN 2 reaction giving methanol, b has β—H undergoes Hofmann ’s elimination giving ethene.

     

     

  • Question 7/10
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    Which of the following gives cis-2,3-diphenyl, 1-2-butene as the major E2 product, when treated with ethanolic KOH solution?

     

    Solutions

     

     




     

     

  • Question 8/10
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    The following elimination reaction, if proceeds by E1cb mechanism, equilibrium mixture would consist of

     

    Solutions

     

     




     

     

  • Question 9/10
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    Comprehension Type

    Direction : This section contains 2 paragraphs, each describing theory, experiments, data, etc. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage I

    The following E2 is carried out with different halogen substituent:

    From the percentage yield of two products observed with different leaving group, it was concluded that both ease of leaving group and steric hindrance to the approach of base CH3 O-  to β-H affect the orientation of elimination reaction.

    Q. 

    Based to the above observation, which flask will have the largest amount of 1-hexene?

     

    Solutions

     

     

    Maximum elimination products would be formed in flask 1 and minimum elimination products would be formed in flask 4. Hence, even the 19% of total products in flask 1 would be much greater than 70% of total products in flask 4.

     

     

  • Question 10/10
    1 / -0.25

    Passage I

    The following E2 is carried out with different halogen substituent:

    From the percentage yield of two products observed with different leaving group, it was concluded that both ease of leaving group and steric hindrance to the approach of base CH3 O-  to β-H affect the orientation of elimination reaction.

    Q. 

    Highest percentage yield of 1-hexene in flask 4 leads us to conclude that

    Solutions

    Fluorine being the poorest leaving group, major product is one that is formed at fastest rate,

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