Which of the following is correct for the electron affinity of halogens?

The $CORRECT$ order of $\Delta H_{eg}$ of the following elements is

In which of the following processes is the least energy required?

Which one of the elements has the maximum electron affinity?

Consider the following conversions:
$(i) \, O_{(g)} + e^- \to O_{(g)}^{-}, \Delta H_1$
$(ii) \, F_{(g)} + e^- \to F_{(g)}^{-}, \Delta H_2$
$(iii) \, Cl_{(g)} + e^- \to Cl_{(g)}^{-}, \Delta H_3$
$(iv) \, O_{(g)}^{-} + e^- \to O_{(g)}^{2-}, \Delta H_4$
Based on the given information,which statement is incorrect?

The least stable ion is