The total number of dative bonds present in all the following $\mathrm{CO}, {\mathrm{NH}}_4\mathrm{Cl}, {\mathrm{Al}}_2{\mathrm{Cl}}_6, \mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6, {\mathrm{HNO}}_3$ and ${\mathrm{CO}}_2$ is

Find out the correct order of ionic character in the following molecules

$\left(\mathrm{i}\right) {\mathrm{SO}}_2$     $\left(\mathrm{ii}\right) {\mathrm{K}}_2\mathrm{O}$     $\left(\mathrm{iii}\right) {\mathrm{N}}_2$    $\left(\mathrm{iv}\right) \mathrm{LiF}$

How many ions of the following have a bond order of  $2.5 ?$ 

${\mathrm{N}}_2^{-};{\mathrm{NO}}^{-};{\mathrm{C}}_2^{-};{\mathrm{N}}_2^{+};{\mathrm{C}}_2^{2-};{\mathrm{CN}}^{+}$