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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is:

    A) Ill > I > II > IV            

    B) IV > I > II > III

    C) I > II > III > IV            

    D) II > I > III > IV

    Correct Answer: A

    Solution :

    [a] III > I > II> IV Reactivity towards electrophilic substitution decreases as the electron density in the benzene ring decreases. Electron donating ability follows order: \[-{{O}^{-}}~>-N{{H}_{2}}-N{{R}_{2}}>-\,O\,C{{H}_{3}}>\] \[-\,NHCOC{{H}_{3}}>-\,C{{H}_{3}}>-X(-F>-CI-Br>I)\] For o, p-directing groups.


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