Which of the following pairs of species have the same number of unpaired electrons but different bond orders?

According to $MO$ theory,the molecule which contains only $\pi$-bonds between the atoms is

The bond order in $NO$ is $2.5$ while that in $NO^{+}$ is $3$. Which of the following statements is true for these two species?

Bond order of $He_{2}$, $He_{2}^{+}$ and $He_{2}^{2+}$ are respectively:

Which information is obtained from the electronic configuration of a molecule in $MO$ theory?

Consider the following changes $I$ and $II$ as shown in the figure. The correct statements about these changes $(I)$ and $(II)$ in accordance with $MO$ theory are:
$A$) In $(I)$ bond order increases by $0.5$ from the existing value.
$B$) In $(II)$ bond order decreases by $0.5$ from the existing value.
$C$) In both $(I)$ and $(II)$ magnetic property is changed.
$D$) In both $(I)$ and $(II)$ magnetic property is not changed.