Question

Which of the following molecular spedes has impaired electron(s) ?

• A. $N_2$
• B. $F_2$
• C. $O_2^-$
• D. $O_2^{2-}$

Answer 1

Answer: (C)

$O_2^-$

Answer 2

$O_2^-$ has one unpaired electron in $\pi^* (2p)$ orbital.