ORGANIC CHEMISTRY. HYDROCARBONS. H H C C H H. OR CH 2 CH 2. H H C C H CH 3. PROPENE CH 2 CH CH 3. CH 3 C CH 2 CH 3. CH 3 CH CHCH 3. CH 3 CH 2 CH CH 2. Examples of Alkenes. ETHENE, C 2 H 4.
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OR CH2 CH2
PROPENE CH2CH CH3
TASK: Use ball & stick models or sketches to construct and name 3 different structures for C4H8 each one with one double bond.
2METHYL PROP 1 ENE
Illustrate structures of the following alkenes:
Name the following alkenes
Triple bond unstable!
BUT–2-ENE CH3 CH CH CH3
GEOMETRIC ISOMERISM each C atom in the doublebond has two differentatoms/groups attached.
Geometric isomerism is a form of STEREOISOMERISM –
Same molecular and structural formula but atoms are arranged differently in space
Alkenes & Alkynes Undergo AdditionReactions:· Much greater chemical reactivity than alkanes· Easily undergo addition reactions at room temperature (calledaddition reaction b/c there is no loss of hydrogen atom(s))
Markovnikov’s Rule:When a hydrogen halide (e.g. HBr) or water (HOH) is added to an alkene the hydrogen atom will bond to the carbon atom within the multiple bond that already had more hydrogen atoms.CH3-CH2-CH=CH2 + HCl -------------------------> CH3-CH2-CH(Cl)-CH3 This rule doesn't apply for the addition of symmetrical reagents like Br2 or Cl2