12th Class Chemistry Haloalkanes and Haloarenes / हैलोएल्केन तथा हैलोएरीन्स Question Bank Assertion And Reason (MCQs) - Haloalkanes and Haloarenes

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    Assertion: Bromobenzene upon reaction with \[B{{r}_{2}}/Fe\] gives 1, 4-dibromobenzene as the major product.
    Reason: In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.

    A) Assertion and reason both are correct statements and reason is correct explanation for assertion.

    B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

    C) Assertion is correct statement but reason is wrong statement.

    D) Assertion is wrong statement but reason is correct statement.

    Correct Answer: C

    Solution :

    Bromobenzene shows both -l effect as well as +M effect; but mesomeric effect dominates the -I character and becomes the directing factor for incoming electrophile. Formation of electrophile: \[Br-Br+FeB{{r}_{3}}\to B{{r}^{+}}FeBr_{4}^{-}\] Bromobenzene acts as an ortho-para director for upcoming electrophiles.


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