Which one is paramagnetic and has the bond order $1/2$?

The bond length of the species $O_2$,$O_2^+$ and $O_2^-$ are in the order of

Which of the following species shows the maximum bond length?

Number of molecules having bond order $2$ from the following molecules is: $C_2, O_2, Be_2, Li_2, Ne_2, N_2, He_2$

The bond order in $N_2$ molecule is

If $x-axis$ is the molecular axis and $p_z$ orbitals participate in bonding,then which one of the following will be the nodal plane present within the $\pi-$ bond of the $O_2$ molecule?