Which of the following molecules is paramagnetic?

Select the correct set of statements regarding the molecular orbital theory of $O_2$:
$A$. Addition of an electron to $O_2$ decreases bond order.
$B$. Addition of an electron to $O_2$ increases bond order.
$C$. Removal of an electron from $O_2$ increases bond length.
$D$. Removal of an electron from $O_2$ decreases bond length.

According to $MOT$,which of the following is correct?

Which of the following has unpaired electron$(s)$?

The bond dissociation energy $(E)$ and bond length $(R)$ of $O_2$,$N_2$,and $F_2$ follow the order as:

Which one of the following is paramagnetic?