Going from fluorine to chlorine,bromine and iodine,the electronegativity

The $EN$ (Electronegativity) of element $A$ is $E_1$ and its $IP$ (Ionization Potential) is $E_2$. Hence,the $EA$ (Electron Affinity) will be:

Which element has the lowest electronegativity?

If $P$,$Q$,$R$ and $S$ are elements of the $3^{rd}$ period of the $p-$block,among these one element is a metal and the rest are non-metals,and their order of electronegativity is given as: $P < Q < R < S$. The chloride compound of which element is hypovalent?

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 $E$.

Which of the following is the correct order of electronegativity?