Which of the following is most electronegative?

Given that the ionization potential and electron gain enthalpy of chlorine are $13 \ eV$ and $4 \ eV$ respectively. The electronegativity of chlorine on the Mulliken scale is approximately equal to: (in $eV$)

Which of the following statements is not correct?

If coordinate $X$ is atomic number,then select the best option for the $Y$ coordinate based on the given graph for $Li$,$Na$,and $K$.

If the difference in electronegativity between $E$ and $O$ is greater than $1.4$,determine the nature of the hydroxide $E-O-H$ of element $E$.

Compare the polarity of the $N-H$ bond and the $N-F$ bond.