Answer:
(b, c)
For increasing first ionisation
enthalpy, the order should be:
\[B\text{ }<\text{ }C\text{ }<\text{
}O\text{ }<\text{ }N.\]
For increasing electron gain
enthalpy, the order should be:
\[I\text{ }<\text{ }Br\text{ }<\text{ }F\text{
}<\text{ }Cl.\]
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