An electrophile is a molecule that forms a bond to its reaction partner (the nucleophile) by accepting both bonding electrons from that reaction partner. Electrophilic reagents are Lewis acids. Carbon dioxide is an electrophile.
A nucleophile is a molecule that forms a bond with its reaction partner (the electrophile) by donating both electrons for that bond. Nucleophiles are Lewis bases. Hydroxide is an example of nucleophile that adds to carbon dioxide.
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