Consider the following conversions:
$(i) \ O_{(g)} + e^- \to O^{-}_{(g)} ; \Delta H_1$
$(ii) \ F_{(g)} + e^- \to F^{-}_{(g)} ; \Delta H_2$
$(iii) \ Cl_{(g)} + e^- \to Cl^{-}_{(g)} ; \Delta H_3$
$(iv) \ Na_{(g)} \to Na^{+}_{(g)} + e^- ; \Delta H_4$
Which of the following statements is incorrect?

• A
  $\Delta H_1$ and $\Delta H_2$ are less negative than $\Delta H_3$
• B
  $\Delta H_2$ is more negative than $\Delta H_1$
• C
  $\Delta H_2$ and $\Delta H_3$ are negative while $\Delta H_1$ is positive
• D
  $\Delta H_1, \Delta H_2$ and $\Delta H_3$ are negative while $\Delta H_4$ is positive