Q60 / 197 · NEET 2009 (Mains) · Chemistry

According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order :

  • A
    $\mathrm{N}_2^{-} < \mathrm{N}_2^{2-} < \mathrm{N}_2$
  • B
    $\mathrm{N}_2^{-} < \mathrm{N}_2 < \mathrm{N}_2^{2-}$
  • Correct answer
    C
    $\mathrm{N}_2^{2-} < \mathrm{N}_2^{-} < \mathrm{N}_2$
  • D
    $\mathrm{N}_2 < \mathrm{N}_2^{2-} < \mathrm{N}_2^{-}$

Solution

$$ \begin{aligned} & \mathrm{N}_2=14 \mathrm{e}=\mathrm{B} \cdot \mathrm{O} \cdot=3 \\ & \mathrm{~N}_2^{-}=15 \mathrm{e}=\mathrm{B} \cdot O \cdot=2.5 \\ & \mathrm{~N}_2^{2-}=16 \mathrm{e}=\mathrm{B} \cdot \mathrm{O} \cdot=2 \end{aligned} $$

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

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