NEET Sample Paper NEET Sample Test Paper-19

  • question_answer The most stable carbonium ion is

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

    B) \[{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,\]

    C) \[C{{H}_{3}}-\underset{+}{\mathop{C}}\,{{H}_{2}}\]             

    D) \[{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{+}{\mathop{C}}\,\]   

    Correct Answer: D

    Solution :

    \[{{({{C}_{6}}{{H}_{5}})}_{3}}{{C}^{+}}\]is the most stable. As the three \[{{C}_{6}}{{H}_{5}}^{-}\]groups attached to the carbonium ion stabilizes it due to resonance. Here the order of stability is given as follows: \[{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{+}{\mathop{C}}\,>{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,>{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}>{{\overset{+}{\mathop{C}}\,}_{2}}>{{\overset{+}{\mathop{C}}\,}_{2}}{{H}_{5}}\] Hence, the correct option is [d].

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