Answer:
(c) Chlorine has higher
electron gain enthalpy than fluorine. This is due to small size of fluorine
atom, i.e., the electron density is high which resists the addition of an
electron
\[\left( \text{F Cl} \right)\].
In general, electron gain
enthalpy decreases as atomic size increases. Thus,
\[Cl\text{ }>\text{
}Br\text{ }>\text{ }I\]
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