Q54 / 180 · NEET 2013 (Karnataka) · Chemistry

The pair of species that has the same bond order in the following is:

  • Correct answer
    A
    $\mathrm{CO}, \mathrm{NO}^{+}$
  • B
    $\mathrm{NO}^{-}, \mathrm{CN}^{-}$
  • C
    $\mathrm{O}_2, \mathrm{~N}_2$
  • D
    $\mathrm{O}_2, \mathrm{~B}_2$

Solution

Both $\mathrm{CO}$ and $\mathrm{NO}^{+}$have 14 electrons. The electronic configuration is $\sigma 1 s^2$ $\sigma^* 1 s^2 \sigma 2 s^2 \sigma^* 2 s^2 \sigma 2 p^2 z \pi 2 p_z^2=\pi 2 p_y^2$ Bond order $=\frac{10-4}{2}=3$

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

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