In $C$,$N$,$O$,and $F$,the electronegativity:

Given below are two statements:
Statement $I$: The correct order of electronegativity of fluorine, oxygen and nitrogen is $F > O > N$.
Statement $II$: The oxidation state of oxygen in $OF_2$ is $+2$ and in $Na_2O$ is $-2$.

Which of the following has no unit?

Which element has the highest electronegativity?

The relative order of electronegativity of $C$,$Ge$,and $Pb$ is

Which of the following bonds is the most polar?