2.1 Unsaturated Hydrocarbons

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Presentation transcript:

2.1 Unsaturated Hydrocarbons Chapter 2.1-2.2 2.1 Unsaturated Hydrocarbons Hydrocarbons that contain at least one C=C (or C=C) are called unsaturated hydrocarbons

Unsaturated hydrocarbons that contain are called aromatic Chapter 2.1-2.2 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

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

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

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

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

THE BOND ANGLE OF AN ALKENE

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

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