A LITTLE LIGHTBULB MOMENT
Acid-base chemistry, resonance and electron flow
Nucleophiles donate; electrophiles accept
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The nucleophile brings the electron snacks; the electrophile opens its bowl.
The idea behind the cue
A nucleophile donates an electron pair to form a bond and acts as a Lewis base. An electrophile accepts an electron pair and acts as a Lewis acid. Formal charge helps identify candidates, but neutral species can also play either role.
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Short & simple
The nucleophile brings the electron snacks; the electrophile opens its bowl.
Acronym
NE — Noodles Eat.
Story
A nucleophile arrives at a party carrying an electron-pair snack tray. An electrophile offers an empty bowl for sharing. The new bond is made from the donated pair, not from a moving positive charge.
Connect the pieces
- N (Noodles) → Nucleophile: Donates an electron pair.
- E (Eat) → Electrophile: Accepts an electron pair.
- Noodles · Nucleophile: Donates an electron pair.
- Eat · Electrophile: Accepts an electron pair.
Know the limits
Nucleophilicity depends on kinetics, solvent and steric effects; it is not identical to Brønsted basicity.
Further reading · OpenStax Organic Chemistry ↗Check your understanding
In hydroxide attack on a carbonyl carbon, which species donates the bond-forming electron pair?
A. The carbonyl carbon
B. A positive charge moving from carbon
C. The solvent’s name
D. The hydroxide oxygen
Reveal explanation
The hydroxide oxygen
Hydroxide donates a lone pair; the carbonyl carbon is the electrophilic site.