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12th Class Chemistry Haloalkanes and Haloarenes / हैलोएल्केन तथा हैलोएरीन्स Question Bank Case Based - Haloalkanes and Haloarenes

  • question_answer
    In the elimination reactions, the reactivity of alkyl halides follows the sequence

    A) R-F>R-Cl>R-Br>R-I

    B) R-I>R-Br>R-Cl>R-F

    C) R-I>R-F>R-Br>R-Cl

    D) R-F>R-I>R-Br>R-Cl

    Correct Answer: B

    Solution :

    The order of bond dissociation energy : \[R-F>R-Cl>R-Br>R-l\]. During dehydrohalogenation C - l bond breaks more easily than C - F bond. So reactivity order of halides: \[R\text{ }\text{ }l\text{ }>\text{ }R\text{ }\text{ }Br\text{ }>\text{ }R\text{ }\text{ }Cl\text{ }>\text{ }R\text{ }-\text{ }F\].


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