Which of the following species is not paramagnetic?

Consider the following species: $CN^{+}$,$CN^{-}$,$NO$,and $CN$. Which one of these will have the highest bond order?

In the following,the correct bond order sequence is:

Fill in the blanks given below:
$(i)$ The Molecular Orbital Theory was proposed by .......... and .......... scientists.
$(ii)$ The addition of atomic orbitals results in the formation of ............ orbitals.
$(iii)$ The distribution of electrons in molecular orbitals is called .......... .
$(iv)$ The number of bonds between atoms joined by a covalent bond is called .......... .

The $\pi$ bond between $Cl$ and $O$ in $ClO_4^-$ is formed by the overlapping of . . . . . . orbitals.

Which of the following molecules is paramagnetic?