BCECE Medical BCECE Medical Solved Papers-2013

  • question_answer
    In HNC, which element has least value of formal charge?

    A)  H                  

    B)  N

    C)  C                  

    D)  All have same value

    Correct Answer: C

    Solution :

    Formal charge, \[F=v-\frac{S}{2}-u\] Where, v = valency electrons s = shared electrons u = unshared electrons \[\underset{2\text{ }shared\text{ }electrons}{\mathop{H-N}}\,\,\,\equiv \,\,\underset{6\text{ }unshared\text{ }electrons}{\mathop{C:\,\leftarrow 2}}\,\] unshared electrons                
    H N C
    v 1 5 4
    s 2 8 6
    u 0 0 2
    F 0 1 -1


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