Which of the following species is paramagnetic?

Which one of the following potential energy $(P.E.)$ graphs is not correctly matched?

According to Molecular Orbital Theory,which of the following statements is/are correct?
$(A)$ $C_2^{2-}$ is expected to be diamagnetic
$(B)$ $O_2^{2+}$ is expected to have a longer bond length than $O_2$
$(C)$ $N_2^{+}$ and $N_2^{-}$ have the same bond order
$(D)$ $He_2^{+}$ has the same energy as two isolated $He$ atoms

Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital Theory?

Identify the correct increasing order of energies of molecular orbitals for the $F_2$ molecule.

The spin-only magnetic moment value of $B_{2}^{+}$ species is $...... \times 10^{-2} \ BM$. (Nearest integer)
[Given : $\sqrt{3}=1.73$ ]