Organic Chemistry AQA CHEM2

UNIT 2 E

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  • Created by: melissa
  • Created on: 11-04-12 14:45

Alkenes

homologous series...same functional group, differ by CH2

CnH2n

UNSATURATED

Obtained by cracking

Bromine goes colourless if an alkene is present

C=C is a region of high electron density

structure restricts C=C bond so ethene is a planar molecule

1 of 3

Addition reactions

with Bromine

...goes colourless

...Br is added across the C=C

2 of 3

Stereoisomerism

same structural formula, different arrangement of atoms

alkenes demonstrate a stereoisomer called geometric stereoisomer

Geometric Stereoisomers

Have restricted rotation

CH3 on the same side = Z-but-2-ene

CH3 on different sides = E-but-2-ene

3 of 3

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