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Aryl chlorides and bromides can be easil...

Aryl chlorides and bromides can be easily prepared by electrophilic substitution of arenas with chlorine and bromine respectively in the presence of Lewis acid catalyst. But why does preparation of aryl iodides requires presence of an oxidising agent?

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Explore conceptually related problems

Arenes when treated with chlorine or bromine in the presence of Lewis acid as a catalyst undergo___________reaction.

Discuss the role of Lewis acids in the preparation of aryl bromides and chlorides in the dark.

Alkyl chlorides can be prepared by refluxing alcohol with thionyl chloride in the presence of pyridine. Why is pyridine used?

Assertion: Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent. Reason: Oxidising agent oxidises I_(2) into HI.

Why can aryl halides not be prepared by reaction of phenol with HCl in the presence of ZnCl_(2) ?

Knowledge Check

  • Arenes when treated with chlorine or bromine in the presence of Lewis acid as a catalyst undergo___________reaction.

    A
    Nucleophilic substitution
    B
    electrophilic substitution
    C
    rearrangement
    D
    dehydrohalogenation

  • Assertion: Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent. Reason: Oxidising agent oxidises I_(2) into HI.

    A
    Assertion and reason both are correct and reason is correct explanation of assertion.
    B
    Assertion and reason both are wrong statements.
    C
    Assertion is correct but reason is wrong statement.
    D
    Assertion is wrong but reason is correct statement.

  • Assertion: Aryl iodides can be prepared by reaction of arenes with iodine in the presence of an oxidising agent. Reason: Oxidising agent oxidises I_(2) into HI.

    A
    Assertion and reason both are correct and reason is correct explanaion of assertion.
    B
    Assertion and reason both are wrong statements.
    C
    Assertion is correct but reason is wrong statement.
    D
    Assertion is wrong but reason is correct statement.
    • DINESH PUBLICATION-HALOALKANES AND HALOARENES-Short Answer Type Questions
    1. Aryl chlorides and bromides can be easily prepared by electrophilic su...

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    2. Out of o- and p-dibromobenzene, which one has higher melting point and...

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    3. Which of the compounds will react faster in S(N)1 reaction with ""^(-)...

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    4. Why iodoform has appreciable antiseptic property?

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    5. Haloarenas are less reactive than haloalkanes and haloalkenes. Explain...

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    6. Discuss the role of Lewis acids in the preparation of aryl bromides an...

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    7. Which of the following compounds (i) and (ii) will not react with a mi...

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    8. Which of the products will be major product in the reaction given belo...

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    9. Why is the solubility of haloalkanes in water very low ?

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    10. Draw other resonating structures related to the given structure and fi...

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    11. Classify the following compounds as primary, secondary and tertiary ha...

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    12. Compound 'A' with molecular formula C(4)H(9)Br is treated with aq. KOH...

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    13. Write the structures and names of the compounds formed when compound '...

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    14. Identify the product A and B formed in the following reaction: CH(3)...

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    15. Which of the following compouds will have the highest melting point an...

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    16. Write down the structures and IUPAC name for neo-pentylbromide.

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    17. A hydrocarbon of molecular mass 72 g mol^(-1) gives a single monochlor...

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    18. Name of the alkene which will yield/chloro 1-methylcyclohexane by its ...

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    19. Which of the following haloalkanes reacts with aqueous KOH most easily...

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    20. Why can aryl halides not be prepared by reaction of phenol with HCl in...

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