Q20 / 160 · WBJEE 2011 · Chemistry

In the following electron - dot structure, calculate the formal charge from left to right nitrogen atom; \(\ddot{\mathrm{N}}=\mathrm{N}=\ddot{\mathrm{N}}\)

  • A
    \(-1,-1,+1\)
  • Correct answer
    B
    \(-1,+1,-1\)
  • C
    \(+1,-1,-1\)
  • D
    \(+1,-1,+1\)

Solution

Hints: Formal chargl= Number of electrons in Valence shell \(-\left(\frac{1}{2} \times\right.\) numbers of electrons as bond pair + numbers of electrons as lone pair) \(\begin{gathered} 1 \quad~~ 2 ~~\quad 3\\ : \ddot{\mathrm{N}}=\mathrm{N}=\ddot{\mathrm{N}}: \end{gathered}\) For \(\mathrm{N}_1 ~\&~ \mathrm{~N}_3\) Formal charge \(=5-\left(\frac{4}{2}+4\right)=5-(6)=-1\) For \(\mathrm{N}_2=5-\frac{1}{2} \times 8-0=5-4=+1\)

Hence, the correct answer is option: 'B'.

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