Which of the following is correct about the number of electrons in the electronic structure of Acetic acid?

Consider the following statements:

${\mathrm{S}}_1$: ${\mathrm{N}}_2{\mathrm{H}}_4$ is pyramidal about each $\mathrm{N}$ atom.

${\mathrm{S}}_2$: ${\mathrm{NH}}_2\mathrm{OH}$ is pyramidal about the $\mathrm{N}$ atom and bent about the $\mathrm{O}$ atom.

${\mathrm{S}}_3$: ${\mathrm{CH}}_3\mathrm{COCl}$ is trigonal about the carbon atom (attached to $\mathrm{O}$ and $\mathrm{Cl}$).

Out of these, select the correct one.

The correct order of bond order values among the following:

$\mathrm{A}. {\mathrm{NO}}^{-} \mathrm{B}. {\mathrm{NO}}^{+} \mathrm{C}. \mathrm{NO} \mathrm{D}. {\mathrm{NO}}^{2+} \mathrm{E}. {\mathrm{NO}}^{2-}$ is

The magnetic moment of  ${\mathrm{KO}}_2$ at room temperature is_______$\mathrm{BM}$.