The bond orders of $He_2^{+}$ and $He_2$ are respectively

The bond order and the magnetic characteristics of $CN^{-}$ are

Which of the following species exhibits the diamagnetic behaviour?

Given below are two statements:
Statement $I$: $A$ $\pi$ bonding $MO$ has lower electron density above and below the inter-nuclear axis.
Statement $II$: The $\pi^*$ antibonding $MO$ has a node between the nuclei.
In the light of the above statements,choose the most appropriate answer from the options given below:

How many bonds (bond order) does $B_2$ have?

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