Chemistry U2M1 - The Alkenes and Reactions
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The functional group of the alkenes?
Why are the alkenes unsaturated?
Becuase the C=C is a multiple bond.
What is the general formula for alkenes?
- but-2-ene has two isomers an E and Z isomer
- The best way to tell if its alkene is to combine it with Br in he dark
Shape and Bonding
- The sigma bond lies along the x-axis between the C=C bond
- The pi bond is above and below the molecule
- Bond angles are 120
- Each carbon atom has 3 sigma bons around it making the shape trigonal.
- There is no free rotation around the C=C bond therefore groups attached to carbons on the C=C bond are fixed.
- CH3 has a higher priority than H
- If the higher priority groups are on different carbons but on the same side of the C=C bon then they are Z-isomers. If they are opposite then they are E-Isomers
- Cis-trans isomerism is if there are two hydrogen atoms and two no-hyrdogen atoms around the double bond.
- Z would be cis-
- E would be trans-
Reactions of Alkenes
The electrons in the pi bond form a covalent bond with the more positive part of the attacking molecule.
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