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

  • question_answer
    Arrange the following alkyl halides in order of dehydrohalogenation; \[{{C}_{2}}{{H}_{5}}I,\,{{C}_{2}}{{H}_{5}}Cl,\,{{C}_{2}}{{H}_{5}}Br,\,{{C}_{2}}{{H}_{5}}F\]

    A) \[{{C}_{2}}{{H}_{5}}F>{{C}_{2}}{{H}_{5}}Cl>{{C}_{2}}{{H}_{5}}Br>{{C}_{2}}{{H}_{5}}I\]

    B) \[{{C}_{2}}{{H}_{5}}I>{{C}_{2}}{{H}_{5}}Br>{{C}_{2}}{{H}_{5}}Cl>{{C}_{2}}{{H}_{5}}F\]

    C) \[{{C}_{2}}{{H}_{5}}I>{{C}_{2}}{{H}_{5}}Cl>{{C}_{2}}{{H}_{5}}Br>{{C}_{2}}{{H}_{5}}F\]

    D) \[{{C}_{2}}{{H}_{5}}F>{{C}_{2}}{{H}_{5}}I>{{C}_{2}}{{H}_{5}}Br>{{C}_{2}}{{H}_{5}}Cl\]

    Correct Answer: B

    Solution :

    The reactivity order can be explained on the basis of C-X bond strength. Lower the bond strength, higher is the reactivity.


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