# $N_2$ and $O_2$ are converted into monoanions $N_2^{-}$ and $O_2^{-}$ respectively which of the following statem is wrong ?

$(A)\;\text{$N_2^{-},N-N$bond weakens} \\ (B)\;\text{In$O_2^{-},O-O$bond order increases} \\(C)\;\text{In$O_2^{-},O-O$bond order decreases} \\(D)\;\text{$N_2^{-}$becomes pagamagnetic}$

$B.O$ in $N_2= \large\frac{(10-4)}{2}$$=3.0 B.O in N_2^{-}= \large\frac{(10-5)}{2}$$=2.5$
$B.O$ in $O_2= \large\frac{(10-6)}{2}$$=2.0 B.O in O_2= \large\frac{(10-7)}{2}$$=1.5$
Hence B is the correct answer.