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  1. 2-Butene | C4H8 | CID 62695 - PubChem

  2. 2-Butene - NIST Chemistry WebBook

  3. 3.4. Isomers | Organic Chemistry 1: An open textbook - Lumen …

  4. 2-Butene | C4H8 - ChemSpider

  5. 2-Butene, (E)- - NIST Chemistry WebBook

  6. But-2-ene - Wikipedia

  7. 2.3: Day 11- Molecular Structure- Isomers - Chemistry LibreTexts

  8. Butene - Wikipedia

  9. 2-butene | chemical compound | Britannica

  10. 26.5: Alkenes and Alkynes - Chemistry LibreTexts

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