Final answer:
Nucleophiles donate electron pairs, electrophiles seek electron pairs, and free radicals contain unpaired electrons.
Explanation:
Nucleophiles are atoms or molecules with an electron pair available for bonding. Two examples are hydroxide ion (OH-) and ammonia (NH3).
Electrophiles are electron-deficient species that seek an electron pair. Examples include hydrogen ion (H+) and carbocations like CH3+.
Free radicals are highly reactive species with unpaired electrons. Examples include methyl radical (CH3•) and hydroxyl radical (OH•).
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