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AMU Medical AMU Solved Paper-2003

  • question_answer
    Pick out the isoelectronic structure from the following\[(I)\overset{+}{\mathop{C}}\,{{H}_{3}}(II){{H}_{3}}\overset{+}{\mathop{O}}\,(III)N{{H}_{3}}\,\,(IV)\overset{-}{\mathop{C}}\,{{H}_{3}}\]

    A)  I and II                                

    B)  III and IV

    C)  II, III and IV       

    D)  III and IV and I

    Correct Answer: C

    Solution :

                     Key Idea Isoelectronic structures have same number of electrons. (i) \[CH_{3}^{+}\]             Number of electrons are                                 \[6+3\times 1-1=8\] (ii) \[{{H}_{3}}{{O}^{+}}\]              Number of electrons are                                 \[3\times 1+8-1=10\] (iii) \[N{{H}_{3}}\]            Number of electrons are                                 \[7+3\times 1=10\] (iv) \[CH_{3}^{-}\]           Number of electrons are                                 \[6+3\times 1+1=10\] In \[{{H}_{3}}{{O}^{+}},\,N{{H}_{3}}\] and \[CH_{3}^{-}\] number of electrons are same therefore, these are isoelectronic structure.


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