Which of the following species contain only  $\pi \,-\,$ bond but exhibit paramagnetic nature ?

${N_2}$ and ${O_2}$ are converted into monoanions $N_2^ - $ and $O_2^ - $ respectively, which of the following statements is wrong

The number and type of bonds in $C_2^{2 - }$ ion in $CaC_2$ are

Which one of the following molecules is expected to exhibit diamagnetic behaviour ?

Use the molecular orbital energy level diagram to show that $\mathrm{N}_{2}$ would be expected to have a triple bond, $\mathrm{F}_{2}$ a single bond and $\mathrm{Ne}_{2}$ no bond.

During the change of $O_2$ to $O_2^-$, the incoming electron goes to the orbital