Identify the pairs in which electron gain enthalpy of the first element is more than that of the second element.
\[
\text{I. } F,\ Br
\]
\[
\text{II. } Na,\ Li
\]
\[
\text{III. } S,\ O
\]
Show Hint
Important exceptions:
\[
Cl>F,\qquad S>O,\qquad Na>Li
\]
for electron gain enthalpy.