• Organic chemistry is three-dimensional.
  • Molecules can differ in the way the atoms are arranged.
  • The same combination of atoms can be assembled in more than one way.
  • These compounds are known as isomers.
  • Isomers are molecules with the same molecular formulas, but different arrangements of atoms.
  • In alkenes, there are multiple structural isomers based on where in the chain the double bond occurs.
  • In alkynes, alkynes display structural isomerism beginning with 1-butyne and 2-Butyne.
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