1. 2.1 Unsaturated Hydrocarbons
Chapter
2.1 Unsaturated Hydrocarbons
Hydrocarbons that contain at least one C=C (or C=C) are called unsaturated hydrocarbons

2. Unsaturated hydrocarbons that contain are called aromatic
Chapter
Unsaturated hydrocarbons that contain at least one C=C are called alkenes
Unsaturated hydrocarbons that contain at least one C=C are called alkynes
Unsaturated hydrocarbons that contain are called aromatic

3. 2.2 Characteristics of Alkenes and Cycloalkenes
Unsaturated hydrocarbons can be open-chain (linear and branched) or cyclic (cycloalkene)

4. Alkenes are acyclic unsaturated hydrocarbons that contain at least one C=C
C2H4

5. Generic formula: Start with CnH2n+2 and minus two for each C=C
one C=C  e.g., C2H4, C3H6, etc.
CnH2n
C2H4

6. ALKENE GEOMETRY
sp2 R R
sp2 C C R R
SHAPE IS TRIGONAL PLANAR

7. THE BOND ANGLE OF AN ALKENE

8. Cycloalkenes are cyclic unsaturated hydrocarbons that contain at least one C=C

9. CnH2n+2-2-2 = CnH2n-2 2 C=C C7H12 1 C=C and 1 ring C9H16 2 rings
Alkenes & cyclic alkanes are constitutional isomers