The bond order and magnetic property of acetylide ion are same as that of

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

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

What will be the CORRECT order of the C-F bond distance among the following?

${\mathrm{CHF}}_3,{\mathrm{CF}}_4,{\mathrm{CH}}_3\mathrm{F}$ and ${\mathrm{CH}}_2{\mathrm{F}}_2$