JEE Main & Advanced Chemistry GOC Question Bank Critical Thinking

  • question_answer Which one of the following species is most stable [IIT-JEE 1995]

    A) \[p-{{O}_{2}}N-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

    B) \[p-C{{H}_{3}}O-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

    C) \[p-Cl-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

    D) \[{{C}_{6}}{{H}_{5}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\]

    Correct Answer: B

    Solution :

    Nitro-group is electron withdrawing therefore decreases stability. Methoxy group is electron releasing. Therefore increases stability by donating electron. Chlorine is also electron withdrawing but its effect is less than \[-N{{O}_{2}}\] group. Hence, correct order of stability.

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