@useinkling: the red hots in your trick-or-treat bag have a resonance structure that shows up on the midterm 🎃 slide 6 is question 3 of today's quiz in the app which resonance form is the real one, for orgo 1 midterm 2 resonance structures and contributors. the 3 rules to rank resonance contributors: 1, full octets first, then fewer charges (an atom with only 6 electrons is the worse form). 2, put the negative formal charge on the more electronegative atom, so O beats C. 3, atoms stay where they are and only electrons move, so moving an H is a different molecule, not resonance. then the curved arrow rule: an arrow starts at electrons (a lone pair or a pi bond) and ends at a new bond or an atom, never at an atom or a charge, and it never moves an atom. worked example, the enolate CH2=CH-O(-) and (-)CH2-CH=O: the form with the negative charge on oxygen contributes more, because oxygen is more electronegative than carbon, so the real enolate looks mostly like that one. slide 5 is the 1 trap 🧐 resonance structures are not an equilibrium: acetate is not flipping between two forms, it is one hybrid where both C-O bonds are equal and each O holds half the negative charge. slides 6 and 7 are from today's quiz in the app, on cinnamaldehyde, the molecule that makes red hots taste like cinnamon 👀 can you tell which atom gets the negative charge in cinnamaldehyde before you open the quiz? 👇 #ochem #organicchemistry #resonance #studytok #examprep

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2026-10-31 18:24:06

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