Question

Which of the following relationships is true?

• A. Bond dissociation energy of $O_2$ and $O_2^{-}$ are same
• B. Bond dissociation energy of $O_2^{+}$ is higher than $O_2$
• C. Bond dissociation energy of $O_2^{-}$ and $O_2^{2-}$ are same
• D. Bond dissociation energy of $O_2^{2-}$ and $O_2^{-}$

Answer 1

Answer: (B)

$M.O.$ configuration of $O_2^{+}:$
$O_2^{+}:\left(\sigma 1s^2\right)\left({\sigma }^{\ast }1s^2\right)\left(\sigma 2s^2\right)\left({\sigma }^{\ast }2s^2\right)\left(\sigma 2p_z^2\right)\left(\pi 2p_x^2=\pi 2p_y^2\right)$
$\left({\pi }^{\ast }2p_x^1\right)$
$B.O.=\frac{10-5}{2}=2.5$
$B.O.of{O}_2=2\left[\begin{array}{ccccccc}{O}_2^{+}& >& O_2& >& O_2^{-}& >& O_2^{2-}\\ 2.5& & 2& & 1.5& & 1\end{array}\right]$