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4.Chemical Bonding and Molecular Structure
medium
Which of the following molecules/ions does not contain unpaired electrons?
A
$N_2^+$
B
$O_2$
C
$O_2^{2-}$
D
$B_2$
(AIEEE-2006)
Solution
Total number of electrons found in $O_{2}$ is $16 .$ But in $O_{2}^{2-}$ The total number of electrons is $18 .$ If we take the configuration of $O_{2}^{2-}$ using Molecular orbital Theory we get
$\sigma_{2 \varepsilon}^{2} \sigma_{\star 2 \delta}^{2} \sigma_{2 z}^{2} \pi_{2 x}^{2} \pi_{2 y}^{2} \pi_{\star 2 x}^{2} \pi_{\star 2 y}^{2}$
Thus there are no unpaired electrons.
Standard 11
Chemistry
