Which is the correct order of electronegativities?

Electronegativity of beryllium $(Be)$ is approximately equal to that of

Which element has the highest electronegativity?

Which of the following is the correct decreasing order of electronegativity values?

Aqueous solutions of two compounds $M_1OH$ and $M_2OH$ are prepared in two different beakers. If the $EN$ of $M_1 = 3.4$,$EN$ of $M_2 = 1.2$,$EN$ of $O = 3.5$,and $EN$ of $H = 2.1$,then the nature of the two solutions will be:

Which one of the following correctly represents the variation of electronegativity $(EN)$ with atomic number $(Z)$ of group $13$ elements?