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The First 3 members of the Alkene group
are:
1. Ethene ­ C2H4
2. Propene ­ C3H6
3. Butene ­ C4H8…read more

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Alkenes contain 2 hydrogen atoms fewer than alkanes because they are
UNSATURATED
This is because they contain a double covalent bond which gives them a
double carbon-carbon bond
Alkenes can become saturated with the use of hydrogen
Ethane Ethene…read more

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E-Z Stereoisomerism
C-C double bonds in alkenes can't rotate easily because they have electron clouds
above and below the plane of the bond
If an alkene has 2 different groups at either end of the double bond, 2 forms of E-
Z stereoisomers can form
These have the same structural formula but the bonds are arranged differently in space
`Z' means that the 2 groups are on the same side of the double bond - another
name for this is `Cis'
`E' means that the 2 groups are on opposite sides of the double bond ­ another
name for this is `Trans'…read more

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For Example...
(Z) (E)…read more

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Methylpropene is a structural isomer, but it cannot have E-Z isomerism
because it has 2 identical groups joined to each carbon atom in a double bond…read more

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