A) 2
B) 1
C) 2.5
D) 1.5
Correct Answer: D
Solution :
The molecular configuration of \[\text{O}_{2}^{-}\] is as \[\sigma 1{{s}^{2}},\overset{*}{\mathop{\sigma }}\,1{{s}^{2}},\sigma 2{{s}^{2}},\overset{*}{\mathop{\sigma }}\,2{{s}^{2}},\sigma 2{{p}_{z}}^{2},\] \[\pi 2p_{y}^{2}\approx \pi 2p_{z}^{2},\overset{*}{\mathop{\pi }}\,2p_{y}^{2}\approx 2p_{z}^{1}\] Bond order \[\frac{{{N}_{b}}-{{N}_{a}}}{2}\] \[=\frac{10-7}{2}\] \[\therefore \] Bond order \[=1.5\]
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